I have just got a copy of PES 4 and am wondering if there are on line capabilities for any of the newer versions of the game, and if so, do they work well?

I am pretty sure 5 does, the eurogamer review makes a brief mention of it.

Pro Evo 5 on the PS2 is basically the best soccer game I've ever played. I haven't played the PC version but I assume it is as good, if not better, assuming the controls have translated over fairly well.

I saw Pro Evo 6 in Japan a couple months ago and it looks a few notches better; I would have rathered seen it come out on Xbox 360 with massively improved graphics but it's a nice minor upgrade that I'm definitely looking forward to.