Nobody was able to do it. They all said it is not possible on the HTC Magician, but Cotulla has proved all of them wrong. HTC Magician owners can now enjoy Windows Mobile 6.1 OS. 

Features:
*128 and 64 ram support
*Word
*Excel
*Ability to choose cpu speed
*50 levels of backlight
*Very fast (in average 33% faster than other Magician roms on video playing)
*Visual theme from WM6.

download from here

Features:
* Facebook Chat
* Photo / Video Uploads directly from your device
* Integrated m.facebook.com browser
* Status Updates
* Chat Message Notifications
* Facebook New Notification indicator
* Unread Inbox Message Indicator
* AppToDate Support
* All Video Modes Friendly
* Touch Friendly
* No 3rd party registration is needed, this app connected directly to the Facebook website.

Installation: 
Download the mobile installer (.cab file) to your desktop. Sync with your mobile phone and copy the .cab installer to your phone. From your phone go to Programs -> File Explorer, navigate to the .cab file and select it. The Installer should do the rest.

No, it is not what you must be thinking by its name. There is no chemistry involved here. Nitrogen is a free music player for the Windows Mobile

~~ Nitrogen for Windows Mobile 5 ~~
~~ Nitrogen for Windows Mobile 6 ~~

related xda-devs thread

This software will install as a today or home plugin and offer the user the possibility of instantly switching the audio between Device Speaker, A2DP Stereo Headsets and Speakerphone.

Download here and did I mention that it is a freeware!

MWC3 (Marshall WaitCursor 3) is an application that replaces the default Windows Mobile WaitCursor.

Features:

• Transparent WaitCursor
• Change the cursor on the fly (no need to reboot)
• Create your own wait cursor
• Define your favorite cursor parameters

download from here

S2P is a nice and very well coded finger friendly MP3 player for the Windows Mobile.

Prerequisition:
- WM5 Phone or WM6/6.1 Professional devices (with built-in Windows Media Player)
- free RAM: at least 3M

DOWNLOAD

If you like the application, you can donate the developer at this link