In alphabetical order, these are the parameters eliminated from Samba-2.2.x through 3.0.21.
admin log
alternate permissions
character set
client codepage
code page directory
coding system
domain admin group
domain guest group
enable svcctl
force unknown acl user
ldap filter
min password length
nt smb support
post script
printer admin
printer driver
printer driver file
printer driver location
read size
source environment
status
strip dot
total print jobs
unicode
use rhosts
valid chars
vfs options
winbind enable local accounts