i wrote this guide on incursions: http://www.dual-boxing.com/showthread.php?t=44297
it was before i really had a chance to do any, just had been doing research. what i can tell you is that my research was accurate, these are the best way for multiboxers to make money without a doubt. not only that but they are extremely fun and challenging - far more than a L5 mission. You have to look at it more like a WoW dungeon if I must use an analogy from another MMO. It takes a smart (albeit simple) group setup. Getting neuted is the biggest danger in all of them.

here's a good reference for incursions: http://incursionguide.wordpress.com/sites/

info about my setup is in my sig, obviously I make the most of mouse broadcasting but in eve is extremely tricky and makes for the need to compromise and sort overviews in nonoptimal ways and hope they match up and filter appropriately so if you hit the wrong target it's not a big deal.

im doing 25 just cause thats the max my curent monitor setup can do effectively. honestly now that i've switched to seperate logistics and DPS ships it's become easier than when I was trying to spider tank and DPS with the same ships.