This is what will be happened in next few years, emerging trends!

(Actually this is my old post from April 2010 - but it was draft version in un-published box)

Trends:
1. Cloud Computing
2. Business Intelligence
3. Mobile Computing
4. 4G Internet

Equivalent to:
1. PHP/Server Side programming
2. Mobile programming: iPhone/Android/WindowsMobile/Bada/Internet TV
3. Interactive Design: HTML5/Flash
4. EcoSystem, Social API: Facebook, Twitter, Zing, Youtube

iOS developer websites

http://chris-software.com/index.php/2009/09/28/how-to-install-apps-on-devices-without-certificate/
http://code.google.com/p/cookbooksamples/downloads/list
https://github.com/javacom/toolchain4#readme
http://www.appsamuck.com/day1.html
http://iphonesdkdev.blogspot.com/search/label/SMS
http://iphonesdkdev.blogspot.com/2011/10/how-to-install-perl-theos-and-iphone.html
http://www.theiphonedev.com/SourceCode/tabid/143/Default.aspx

Debugging
http://robertjmccabe.blogspot.com/2011/02/iphone-debugging.html

http://www.iphonedevsdk.com/forum/iphone-sdk-tutorials/93644-how-to-design-an-iphone-app-with-custom-ui-video-tutorial.html

http://www.netmagazine.com/tutorials/getting-started-phonegap

http://www.codeproject.com/Articles/108768/Preparing-the-ground-for-iPhone-development

http://wikee.iphwn.org/main

http://www.iphonedevsdk.com/forum/iphone-sdk-development-forums/

Manually install/remove iPhone software

If you get a chance to download ipa file but don't know how to install it to your iPhone, iPad? Here are some tips:

INSTALL MANUALLY
1/ Using Installous:
- Download your desired ipa file (or ssh to your iPhone)
- In case if you download directly on your Safari, you can use iFile to move it to Installous folder (/private/var/mobile/Documents/Installous/Downloads)
- Open Installous then install it

2/ Using  dpkg -i to install your application (*.deb file)

UNINSTALL MANUALLY

1/ SSH to your mobile phone
2/ Delete your application under folder: /var/stash/Applications/<application name>
3/ And/Or delete your application under folder /private/var/mobile/Applications/<application id/code>
This is a bit hard for you to know which application id/code folder belongs to which application, so you basically have to go in that folder and find <application name>.app folder that equivalent to you application name (you have to guess and make sure correct folder yourself)

Detail example:

1/ How to find your application folder?
Change to default application folder: cd /private/var/mobile/Applications/<application id/code>
Find your application folder that you wish to delete: ls -R | grep 


Another way is using SBSettings\System Wide Options\App Folders, then select your application to see it folder

2/ Delete application: rm -fR /private/var/mobile/Application/<application id/code>

Basic understandings of iPhone/iPad

1/ iOS is unix-based operating system - debian/ubuntu? so that's reason why there are some workforce to port iPhone GCC compiler to Ubuntu - https://github.com/javacom/toolchain4#readme - need study, confirmed?
- So please do remember some constraints related to security matters, eg: you ssh (using root) a file to iPhone and then your application (default using 'mobile' user) to access that file - it'll be failed due to security

2/ IPA package is generally zip file with content inside

3/ Some important folders/directories in iOS
- Default user-home folder: /private/var/mobile
- User-home Application folder: /private/var/mobile/Applications - This is where all the real application code, data stored - so if you want to hack your application - come in here
- User's application data: /private/var/mobile/Documents/ - This is where you see your working data in application stored
- Default iPhone Application folder:  /var/stash/Applications
TBC

4/ Package in iOS
- deb file: is a traditional debian package file so you can use debian command to install, remove it, eg: dpkg -i

- ipa file

5/ Default root password: alpine

Some useful applications for iPhone/iPad

1/ PaperBoss:
I need to study courses, and I made decision to use FlashCards technique. I googled around and finally there were no suitable application on iPhone, iPad. So I had an idea is to create Flash Card myself (picture) and set it as PC's wallpaper, iPhone/iPad wallpaper interval. I found an application: PaperBoss, that was quite very old application in iOS, it's crashed all the time (during setting/configuration works) but it still works normally background somehow

2/ TBC

Useful commands in iPhone/iPad terminal

1/ Want to reboot your iphone/ipad? Connect to terminal (or SSH) and issue command: reboot

2/ Want to restart SpringBoard? Connect to terminal (or SSH) and issue command: killall SpringBoard
TBC

3/ Want to start/stop service in iPhone, speeding up your iPhone?

Start vsftpd (daemon/background service)
launchctl load /System/Library/LaunchDaemons/com.bigboss.vsftpd.Startup.plist

Stop vsftpd daemon
launchctl unload /System/Library/LaunchDaemons/com.bigboss.vsftpd.Startup.plist

Start sshd
launchctl load /Library/LaunchDaemons/com.openssh.sshd.plist

Stop sshd
launchctl unload /Library/LaunchDaemons/com.openssh.sshd.plist

View all working processes
ps -ax

View working processes, and its status
top

View disk free on your iphone
df -h

View used command in terminal
history

View your iPhone information: Kernel, Hardware, iPhone name, etc.
hostinfo

Or
uname -a

View network connections to/from your iphone
netstat -s

Configure your iphone network interface
ifconfig -a

Manipulate packages: install, list, remove, etc.
dpkg -l

View help system
help

Some sources for your free/cracked iPhone/iPad app:

1/ Cydia (in this application you can add many application sources/repositories, you can google it)

2/ Installous (this can be installed from Cydia)

3/ HipStore (this can be installed from Cydia; source: store.heaveniphone.com)

4/ AppStoreVN (this can be installed from Cydia)

5/ Installer (this can be installed from Cydia)