[Shohan]

Maybe not must have apps for everyone, but these are all great for my needs.

FTouchFlo - Finger scrolling like on the Touch or iPhone. Really makes one handed operation easy. Can also launch programs.
QuickMenu - Adds a nested menu system similiar to your XP start ment. Really great app. Built-in close program option and many others.
PocketCM - Contacts replacement. Built-in finger scrolling and easier to jump to a certain letter of the alphabet.
Palringo - IM app. Yahoo, AIM, MSN, etc. In my opinion better that OctroTalk and Slick. Tabbed conversations and today screen plugin.
MobiPocket - eBook reader. Converts a number of file formats for easy reading on PPC or smartphone. Auto scrolling feature. Desktop client as well for syncing ebooks to PPC.
TCPMP with Flash Video Bundle - Better video player the WMP and supports YouTube and other video websites.
WinamPAQ - Winamp port for PPC. Works just like Winamp and is great.
PDANet - ($) Great for tethering to a laptop. (Or do the registry hack for the built-in ICS app.)
Resco Explorer - ($) Much better file explorer. Many great features. Built-in FTP and Registry editor.
Resco Radio - ($) Streaming Internet radio app. Works great and you can setup your own streams.
SPB Wallet - ($) Information manager for passwords, credit card numbers, or other information. Password protected and AES encrypted files.
SPB Backup - ($) Hard reset your phone, install apps and configure as you like. Then when your phone screws up, simply hard reset again and run the backup file and your phone is restored. Great app.
Slide2Unlock2 - iPhone like app that requires a sliding of a button from left to right to unlock the phone. Helps keep things from being pressed on the touchscreen.
VJCandela for 6800 - Flashlight app. I assign it to a hard button and when I press it the cameras LED comes on. Good for dark places?
HTC Touch Camera Album - Cool picture viewer with finger control for next/previous picture, zooming and slideshow.
HTC Home Customizer - Clock with SMS, email, and missed call notification, weather, app launcher, picture contacts, music player, and ringer profile changer.
MyMobiler - Control your PPC from your PC. You can use the mouse and type on your desktop keyboard.
PocketRAR - for unRAR'ing things...
SIPChange and NullKB - SIPChange will run on soft rebot and configures the default SIP (onscreen keyboard) of your choice. NullKB is no onscreen keyboard at all and can prevent the annoying popup of the onscreen keyboard.
wkTASK - Program buttons like in Windows, can minimize programs, close programs with the x button, terminate frozen apps.
1-Calc Lite - Better calculator program in my opinion. Unit conversion, tip calculator.
GoogleMaps - Come on it's Google maps on your phone.
Live Search - Like GoogleMaps, but with voice recognition, gas, movie prices etc. Great app.
ThreadedSMS - IM like conversations for your text messages. Much easier to follow a conversation.
OpenVPN - VPN access on your phone. Cool!
PIEPlus - ($) Add on features for Pocket IE. Tabbed browsing, website alias, finger scrolling, lot's of good stuff. Works great.
Pocket puTTY - If you require SSH/telnet.
VistaHide Battery Meter - Thin bar at top of the screen indicating battery status. Non-obtrusive.
Remote Desktop - RDP into your PC.
Oxios Memory - Free up RAM from idle programs without having to soft reboot.