The large volume of excellent data.
The long, long effort over years of time.
The nifty utilities.
The nice Elo calculated lists, carefully separated by time control and even means of calculation!
Plus, he is a very nice guy to talk to.
Please put Lyapko George's site up on the top bar, where he rightfully belongs.
OK, OK, I am also lazy and only scroll to the bottom from time to time and want to click right to George's place easily.

my ftp site {remove http:// unless you like error messages}