Requirements: Windows Mobile 2003/SE/WM5/WM6 PocketPs with GPS receiver
Overview: Add full-featured navigation to your GPS-enabled smartphone with Garmin Mobile XT. Just plug this data card into your compatible phone¹ (see specs tab) and start navigating. With no monthly fees, preloaded maps, turn-by-turn directions, real-time services and only $99, this easy-to-use data card has everything you need to navigate to the front door.

Download:

http://www8.garmin.com/software/GarminMobileXTforWindowsMobile_42020w.exe

Alternate Download Link:
Download Instructions: All credits for the кεygεngo to JetMouse, as well as Lord Yuz and starix who helped with the creation of the кεygεn.

Installation procedure:

a) Start installation of ‘GarminMobileXTforWindowsMobile_42020w.exe’ from PC through ActiveSync. Select your Storage Card as destination. During the installation, files will be copied to your storage card. The files should appear in ‘\Storage Card\Garmin\Apps\WM’.
b) Install ‘GarminMobileXTSupportFiles_4xxxx.exe’ for voice files.
c) Install ‘GarminMobileXTFreeBasemap_4xxxx.exe’ for Garmin’s base map.
d) Run GarminMobileXT and record the Unit ID and use кεygεnto create unlock key.
e) Save as sw.nl file.
f) Copy ‘sw.unl’ to ‘\Storage Card\Garmin’.

Also you can search old post, you may get more information.
Rapidshare: http://rapidshare.com/files/97174658/garmin_mobile_xt.rar.html
4Shared: http://www.4shared.com/file/39850879/56d0b283/garmin_mobile_xt.html
Megaupload: http://www.megaupload.com/?d=6J9K3H4U

Enjoy!