Ran across this and thought it was really handy to compare the various Intel processors currently available:
http://www.xbitlabs.com/misc/picture/?src=/images/cpu/pentium-e2160/table.png&1=1
Interesting that the Core 2 Extreme X6800, Core 2 Duo E6XXX and E4XXX, and E21XX chips all use the same Conroe core... It's just clock speed, L2 cache, and Intel VT and TXT (whatever that is) that separates them.
Also interesting reading, what all the numbers for the different types of RAM mean:
http://forums.hardwarelogic.com/f32/what-does-all-ram-stuff-mean-8929.html