Comment Trend Micro (Score 2, Informative) 359
For our little business of around ~35 people, we use Trend Micro OfficeScan. You need to check out what it costs, but I can tell you it works well here. To uninstall/configure the program on each client there's a central password and every noticed virus gets e-mailed to the sysadmin. The program is very stable too, and doesn't noticeably slow the system down.
