Mac Pro seeming to slow

I have knowticed the last month or so that my MacPro has begun to slow down on normal tasks. I was wondering if there are any programs / apps that i might need to get to either remove unsued files / folders or to unclutter my system.

MacPro 8 Core
2x 2.26Ghz Quad-Core Intel Xeon
6 GB DDR3
NVIDIA GeForce GT 120 512MG PCIe

G'day and welcome to the forums.

How full is your hard drive? Drives need some 15% free space in order to operate at peak performance. If all is well there download Onyx and do some maintenance and cleaning of your Mac Pro.

http://www.apple.com/downloads/macosx/system_disk_utilities/onyx.html