These are my problems with SL 10.6.1 after about a month now. In rank of importance to me: 1.) I can't get my external monitor to display the correct colors like I had on 10.5. Yes, I know Apple changed the gamma default but I can't seem to get rid of that violet/purple tint that's was a perfect blue at one time. The same profile I use under Leopard yields vastly different results under SL. I use a Spyder3 colormeter which worked just fine prior to my upgrade and gave perfect results. Deleted my icc profiles a number of times and started over from scratch. Still no success. Every once in a while I'll plug my external monitor in and the right colors will display for a few seconds then revert to the violet/purple. 2.) My CPU is definitely running 5-10 degrees (F) hotter. Consequently, fans are also spinning 500-750rpm faster compared to doing the same tasks under Leopard. (And no, I'm not interested in running 3rd party fan apps). 3.) Implementing Flash was never Apple's field of expertise but I think it's much worse on SL and seems to contribute to the CPU heat/fan problems mentioned above. While Safari has only crashed on me twice, both times it brought down the whole application instead of just the offending page. Once was while running in 32bit mode, the other in 64bit. I'm attributing this to OSX 10.6 because Safari 4 worked fine under Leopard. 4.) I had forgotten how much I missed the old Expose in Leopard compared to the new flavor. I just can't get used to having my puny 13 screen dedicate the lower half to minimized applications I don't care about. (That's why they're minimized). It's even kind of choppy now in comparison. The old Expose is smooth and flowing with nice big-assed windows. I've been flipping between 10.5 and 10.6 when doing photo work so I can use my external monitor. Since I upgraded to 10.6 right over Leopard, my next step is a clean, scratch install but in addition to just dreading this time consuming process I'm somewhat doubtful some of these things will change.