I've always been aware of Safari's infernal memory leaks, but this time it reached a whole new level. Running 4GB of RAM doing some routine sound cleaning in Sound Studio, Photoshop open, iTunes, Safari, iCal, Adium...the usual, and I'm shocked to see how sluggish my Mac is, it's never in the entire year I had it taken so long to perform regular tasks. I fired up Activity Monitor and to my utter HORROR, under the colour palettes next to "Used:", there's a fugly number: 3.86 GB. So I sort by Real Mem and there's our exotic friend Safari, towering above all else with a footprint of 792MB. Safari didn't even have 5 tabs open, let alone the number that SHOULD be required to reach such a high level of memory usage. There were 3 tabs open. Three. None of them flash or video heavy, just regular text websites/forums. Rule to self: quitting Safari less than the number of times you bash Mac OS X , weekly, will cause severe repercussions. (aka I never quit it). Running 10A411 and 4.0.3, in case anyone's wondering. Just thought I'd share. Wish I had a screenshot before I quit Safari.