In the 2.0.x series, the largest diff is the smbfs update. This one should
fix a lot of race conditions found with the new users of 2.0.x, hopefully
it's stable. The patches also fix the Teles ISDN driver compilation
problem and update a few SCSI drivers a bit.
The 2.1.x kernel contains the same smbfs updates and additionally have
various other interesting patches (ipv6, ide-cd, arcnet driver update,
sound driver update, user access cleanups etc). It should also fix the #!
script running bug (patches have floated around on the mailing list
already).
Check it out, send me comments, and dance joyously in the streets,
Linus