In Desktop Manager, click on Application Loader. You will want to UNCHECK BlackBerry Maps. That will delete it from your device. Then press next or whatever.
No Gryz, your link is for the Desktop Manager, you already have that installed. You also need the Device Software. Go here: BlackBerry® Software Updates select the 8130 and download the "BlackBerry Device Software v4.3 (updated 11-13-2007)" to your PC. Install it and continue as js described above.
I have yet to add google maps to my device. I used to use it (actually it came loaded) on my Treo.
Why do you like it better?
When in the contacts application does it allow you or offer to you the ability to map location with google maps installed instead of BB maps?
Thanks