Just grabbed a copy from newsgroups - installed it fine and it's running nicely, converted the latest speedcams from pgpsw site for it and first impressions are pretty good - but not worth 60 euros when the maps are a year old already (same maps as the symbian version that's been out for a year or so now).
Copy the folders across to the N900 internal memory (in mass storage mode) - Don't copy the keygen folder - just need to copy the 3 folders - Drive, Maps, Res and the SetupMobileMaps.deb installation file
Start xterminal and type
sudo gainroot <enter> (assuming you've already got the "Rootsh" app installed - if not then install it from maemo.org/downloads/product/Maemo5/rootsh/)
cd MyDocs <enter>
dpkg -i SetupMobileMaps.deb <enter>
Watch it installs ok (takes about 30 seconds)
disconnect phone from the USB cable and start Mobile Maps (probably shows in the "Other" folder on the applications screen
Select activate and manual (basically follow you nose until it gives you a code for activation - THEN back on your PC
Start the keygen, click the search button and browse to the Mobile Maps 9 Europe.mlm file (should be in the same folder as the keygen)
Enter your activation code in the other window on the keygen screen (probably your imei number - mine was)
Generate the code, type it into the phone and enjoy - simples
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