OK, I will post a list:
SME with Tomcat for some limited development use (intranet only)
OpenOffice hosting for 4 to 5 thin clients
IMAP Mirroring of external email for 8 users, fairly heavy use
RedLight or Tracs
Subversion (maybe, probably on different machine)
Gallery2 for Internal use (Engineering images)
Bugzilla
LDAP
Remote access
Moogle (periodically)
+
KnowledgeTree (Document Manager, althogh this could also be on a seperate machine)
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So 8 full time users, 5 part-time users - core tasks
File Serving and Document/Code/Image management
Email management/archiving and LDAP
No real print service
Right now I've got several machines plugging away at various tasks and an old SBS2000 server that needs to go.