If you are looking for specific installation guides or "ready-to-go" packs, these communities are the primary sources:
Excellent for global maps and international skins. igo-primo-nextgen-9-18-40-671989-wince-ru-multi
Tweaks in the sys.txt file to prevent "Out of Memory" errors on 64MB or 128MB devices. If you are looking for specific installation guides
The definitive source for WinCE-based GPS software and technical troubleshooting for the RU-Multi versions. igo-primo-nextgen-9-18-40-671989-wince-ru-multi