I would be using it for DCHP DNS SAMBA Potentially some web services, but that would only be for a small <20 users
I have three Fedora servers running DNS, DHCP, LDAP and SAMBA. I had a little trouble with LDAP running out of file descriptors, but that's mostly resolved itself since I upgraded the clients. The systems have not crashed at all and have currently been running for 65 days.
These are SMP systems (Dell Poweredge 2550).