New Mission Control Desktops are hot, especially flipping through them with two finger swipe. Back and forward single finger scroll is great on Safari, but does not work on Firefox 5 and on Google Chrome browsers.
Overall I like the OS X Lion and the new features like Mission Control with the new virtual desktop implementation is great. Yesterday I ran into the first gesture issue with the new default scrolling direction, which is totally confusing. Good thing that you can switch that off. Now there is a bigger problem with gestures and Firefox 5 and Chrome browser. I have it now setup that I can fllp through full screen apps and desktops with two finger swipes on my magic mouse. The back and forward gesture is single finger scrolling (left/right). This works great on Safari. It also looks awesome. You just stay on the mouse and go forward and backward in your browsing history. I also use though Firefox, because I use a special add-on only available on Firefox.
Firefox is not supporting the back and forward gesture, which of course sucks. The Mozilla people actually have to fix this. A bug report is already filed here. Come on Mozilla developers! Please get on this and release an update. This message also goes to the Google guys. The Chrome browser is also not supporting the back and forward gesture.