Hello!
Our team almost finished working on Mnemosyne 2.0.0beta6. There are 2 release candidates in extras-devel for Diablo and we plan to release beta6 soon.
It woks on N900, but there are some bugs with native N900 dialog and some UI bugs. Of course, we are going to fix these bugs and release version for N900.
The problem with N900 is that at the beginning of this project [1] we planed to port Mnemosyne to Maemo4 platform and adapted UI to using without styles. Now, we have Maemo 5 UI and I don't know what to do - rewrite current UI for N900 using Maemo5 native UI or still use current UI.

[1] - https://www.assembla.com/spaces/pomni