Looks like they’ve fixed the problem with SMB shares breaking. This fstab entry is currently working for me:
# Athena on Puck
192.168.1.1/Athena /media/Athena cifs auto,user,pass=password_goes_here,nounix,noserverino,rw,iocharset=utf8,file_mode=0777,dir_mode=0777 0 0
Ubuntu version 9.10
EDIT: At first I had the relevant line commented out (//), sorry about that. “192.168.1.1” is the IP address of your Time Capsule. Make sure your firewall will allow access on the correct port (set in Time Capsule setup on the Mac).