Memory Timing Explanation

Where can I find a good explanation of memory timing? I've looked around but haven't come across anything that really spells out what terms like "CL2.5" and "3-8-4-4" mean.

Thanks in advance....

Saw someone post this yesterday and thought it was pretty nice:
http://www.corsairmicro.com/memory_...3707/index.html

This sticky may also be helpful for you:

http://forum.oc-forums.com/vb/showthread.php?s=&threadid=62006

Thanks for the links! Unfortunately, the 1st one didn't work. I think it got truncated by the forum software. Is there any way to post the entire URL? In the meanwhile I'll browse their site and see if I can find what I'm looking for.