Experience is worth more than taking tests, but professional certifications do show a level of accomplishment and a desire to maintain a current level of knowledge. Current certifications held by those at Artegenix include:
Apple
ACTC (Mac OS X Server) 10.4, 10.5, 10.6
ACHDS (Mac OS X) 10.4
ACSP (Mac OS X) 10.5, 10.6, XSAN 2.0, Final Cut Server
Microsoft
Small Business Specialist.
Microsoft Certified Professional, Windows 2000, Small Business Server 2003R2
Microsoft Certified Technical Specialist, Small Business Server 2008