RescueOS, that can be used to load in ram and might get your files off => http://talk.maemo.org/showthread.php?t=75369


prior to trying I suggest to read all documentation very carefully:
http://206.253.166.96/N900/rescueOS/documentation.txt

Once in RescueOS, I think you need to cd to /RescueOS/
and issue /rescueOS/mass-storage-enable.sh

I never used RescueOS myself yet, so I can't help you on that matter but don't be afraid to post here your problems, if you run into any. Good luck