Apparently you can connect your PS2 through your computer and download this program called "XLink Kai" and play online still.
Here's a video showing it working and also has a brief description of how it works:
I love this game and I know a lot of others here have mentioned they like it as well. Is there any interest in us all setting this up and playing together semi-regularly? I'd like to do this if you guys would.
I might want to try this, my ps2 is at home however, so I won't be able to play regularly, but I can try it later this week (thursday-friday). I'm European, so it might not work out due to time zones, but it sounds like a good idea!
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I'm but a simple companion in the pack of gurus whereof SuperNiceDog is the pack leader!