What's new? (Score 2)

Hi everyone. Okay I'm not new to Linux but I'm no programmer. I've upgraded to kernel 2.2.6 -- probably due to my M*cr*s*ft mind-set that takes over from time to time -- upgrade! submit! comply!
But in all honesty I have *no* idea how the 2.2 series differ from the 2.0 series RedHat ships with.
Could someone here (strip sarcasm ; cat witty_asides > /dev/null) please explain the advantages/differences of 2.2.6 over, say, 2.0.36...
Thanks! May segfaults never darken your monitor...