In case anyone is hesitant about the Cordless action...
I fully recommend the Cordless Action for PS2. At $30 there's no reason not to get it. It really rivals the Wavebird (I get better performance due to the 2.4Ghz auto-frequency, since my 802.11b router doesn't interfere on that band like it does for the 900MHz Wavebird), except in comfort. The analogs feel like they will be in for the long haul and the R3/L3 clicks are much stiffer. For people that play alot of games with R3/L3 usage (hello, SOCOM) this is a must, as I have killed two controllers already due to that game.
If you read that review on IGN, they'll say that the analogs are a bit too loose. Anyone that plays a lot of games on their PS2 knows that the DS2 analogs start out nice and stiff, but loosen up like the village bicycle over time. The analogs on the Logitech controller are somewhere between where the DS2 starts, and where it inevitably ends up. The construction feels more solid, and I don't see any loosening in the analogs just yet.