The update was quite simple (i just installed over my existing Lion) and i am quite impressed. Its overall faster, more stable and imho ready to be used as a productive system.
Here is a quick overview whats new and improved.
Samba (Windows shares) finally works again and its way faster then in Snow Leopard.
Launchpad the iOS styled App launcher is actually useable and stable now.
iCal has a new design.
The sleep mode which gave me a lot of trouble in the developer preview 1 works now perfect again.
A quick test with Portal shows improved graphic performance, i gonna make detailed benchmarks soon.
The Finder is more responsive and seems as stable as in Snow Leopard.
Tabs provided by Total Finder
A new iTunes version 10.2.2b2 (4)
Video is from developer preview 1 but should give you an impression how cool lion actually is.
Overall the system is faster, more stable and in my humble opinion ready for a gold master.
For more details check my other posts about Lion:Mission Control, Launchpad, Spaces and Dashboard