2 for me! 4 is probably my max amount. I do understand why people multi table a lot of tables but then it just starts to become retarded and annoying when u have Two or three monitors full of tables....I had AA go into the muck when I first tried multi tabling more than 10 tables once because I was unaware it was my move on that table (TICK TICK) Fold!!!! Sigh.....
Four tables for me, solely because I like all tables visible at the same time. Fast/6max/9, all four.