Another point I wish to add. Its obvious but worth a mention.

Using a Buddy list of some sort!!! Some sites allow you to create one but you may have to just enter a comment on PT about the player.

At lower stakes players are just bad to poor anyway but at higher stakes its very important since your edge over the games get smaller. But even at 25-100Nl why not just look them up before you start a session.

Seek you easiest prey out before someone else takes their money.