We have two CycloDS Evolution cards. One with a 1Gb MicroSD , and one with a 2Gb.
I have successfully set up and run moonshell, DSOrganise and of course, hundreds of games!
Played a bit with movies on Moonshell - working on some DPG encoding scripts.
Formatted the MicroSD cards on Ubuntu with QTParted with Fat32 partitions.
A good backup procedure for the sav files!
The latest DSOrganise trashed the partitions on both sd cards - reformatting required
http://en.wikipedia.org/wiki/Nintendo_DS_storage_devices#CycloDS_Evolution
http://www.cyclopsds.com/
http://www.teamcyclops.com/forum/