Any thoughts on playing more than 1 table at a time online?

[Scorpius]

I see some players, even at high limits, playing 2 tables at a time in Omaha/8. Some seem to do real well, but others seem to just tread water. The articles I've read discourage it. Is there anyone who has been successful at it, and if so, what helped you be successful doing more than 1 table. I tried it a couple times, but it seemed too distracting with the screens popping up back and forth constantly from one to the other. Are there any online sites that will allow you to play more than 2 tables? I think one poster on here said he played 3 before.