I bought a N800 before Xmas, and has been playing with it since then. Currently I have MM 1.4.7 installed, it works pretty well.

Some issues I found:

It crashes my SD card from time to time, I have to pull the card to fix the file system on PC. Browsing the map to download is slow, esp for the detailed maps, due to the small screen of the tablet.

I use the winmapper in PC to download map tiles, but it's not convenient as browsing download capability. So two days ago I decided to write a utility to do the same in Windows, and now it's basically done. You browse google map with IE, after that the tool will pull all map tiles from IE cache and organize them in z/x/y.jpg directory structure, just like MM does - so you do that in PC and it's much faster to download, since PC has a big screen.

The issue with z/x/y.jpg structure is that it takes too much space, I found 40m map tiles take >200m space, 80% space wasted. I am considering now to upgrade to MM 2.2. The question is MM 2.2 will use much less space since it uses DBM, how about its speed efficency? Anybody has comment on it?

I will upgrade my tool to support the new DBM map data, let it convert the map tiles from z/x/y.jpg structure into DBM database, so map downloading for MM 2.2 will be done in PC as well. I am not very good at Linux programming and have a question for John: in reading the MM source code, I found both sqlite3 and GDBM are used for map data storage. My question is which is better? Anybody having experience in both systems?

I need some comments about those.