One of the guys that I work with sent me this link.  Its a really good presentation that GKH gave at Google Tech Talks.  For those that don’t know who GKH is, he is a Novell employee that started the Linux Driver Project.  There were some really cool stats about the kernel and its development in there.  For example, on a per day basis there are 4,300 lines added, 1,800 lines removed, and 1,500 lines modified on the stable kernel (2007 – 2008). You have to watch to see the rest.