The Online Gaming Zeitgeist website has taken the stats from the last 365 days. There is a seven-day average into accounts when plotting this data. All graphics are updated daily, as said at the website.
Behind CS: Source comes Battlefield 2 with only 20,000 players and then Wolfenstein: Enemy Territory with 10,000.
The Order
1. Counter-Strike
2. CS: Source
3. Battlefield 2
4. Wolfenstein: Enemy Territory
5. CS: Condition Zero
6. Team Fortress 2
7. Battlefield 2142
News
Counter-Strike 1.6 leads stats

Online Gaming Zeitgeist have listed a complete stats breakdown of different First-Person-Shooter games. And what best, Counter-Strike 1.6 is leading with its 90,000 active players while CS: Source comes second with only 55,000.
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Except Mon-Fri with "you gotta be in work so get the f*ck out of bed" I like to sleep till afternoon too.
Simply the perfect game to be played.
not.
But you can know cs 1.6 is the most played :P
It would be great to see Valve correcting the bugs of their best game :)
A written proof that 1.6 is better than CS:S :D
So now 1.6 fanclub can point at it and say "NÄÄ NÄÄ, WE IZ BETTER MONGOLS"