I had many problems with SP3.0 and ended up going back to SP1.0. Our SW liason recommended NOT going to SP3.0 because it reintroduced a lot of the glitches that SP1.0 fixed.
Thanks Scott - I have tried 2.1 and had problems with it. Was excited to see 3.0 until all the problems with that. 1.0 is the most stable for me. Besides, SW has yanked all SP2's off the site for download. 1.0 and 3.0 are the only available ones. I'll stick with 1.0 until the next SP comes around.