UPDATE:

Hi all. I was one of the people moaning about the woeful volume levels on my T-Mobile UK Desire. I solved the issue by flashing with a generic ROM (although it seems to be a Virgin Media ROM judging from the bookmarks)Anyway, being in the UK I didn't have access to the free Google Navigation...I even gave the Brut hack a try but uninstalled it due to it's unstable nature and lack of features.Well, I've just been prompted to update to Maps 4.1.1 and I now have navigation. Fully functional, with the arrow and the street name (both missing in the hacked version)Is this a general roll out by Google? Is this now available to everyone, even on branded ROMs, or is this an added bonus of flashing a generic ROM?Let me knowGoogle officially verify Navigation: http://www.google.com/intl/en_uk/mobile/navigation/