albo - 2:51 pm on Mar 26, 2010 (gmt 0)
I agree with @JAB Creations on one thing especially: AOL catches me every danged time. I have two friends (one of whom is also a client) who have AOL, and one, to boot, has it on a low-res monitor: a REAL challenge!
We're fortunate, at home, to have both MacOSX and Windows boxes, so I get a good spread of browsers. I've quit supporting IE6 (except for "graceful degrade"). I put in warning code adapted from ie6nomore dot com advising visitors to upgrade and providing links to do so.
Else, I test with "major 5" (Webkit, FF, Opera, Chrome, IE) and throw in Camino, Flock, Avant, and visit persnickety W3 browser Amaya offline just for the heck of it.