The tray icons at the bottom of the Today screen may be nice but for some they take up too much of the screens real estate. In the Windows Mobile 5.0 all you needed to do was remove the T-Mobile Hotspot utility and the Tray_init.lnk from the /Windows/startup directory.
This is not the case with Windows Mobile 6, Microsoft cleaned up the tray function and made it part of the init sequence during boot time. This means that it has to be removed from the registry. Here is the key that have to be deleted.
\HKLM\init\Launch92 string value Trayap.exe
Perform a soft reboot.
I used Total Commander found in Windows Mobile Application list here. As always be careful that you are deleting the right registry entry since it affects how the system boots.
Today screen with the tray at the bottom
Thanks to MyDigital Life - http://www.mydigitallife.us/2007/06/tmobile_wing_to.html