Changes in newest update to Lion:
1) There were some bugs in DP2 with Shockwave and Flash where the mouse wouldn't work and only input from the keyboard properly registered. I noticed this in some games. With the latest update, Flash works perfectly. Shockwave registers clicks, although it's a little buggy at times (but this is really Shockwave's fault. It's old, and Snow Leopard had the exact same problems.)
2) iCal is now much more subdued looking. Black fonts have been replaced with medium-level greys. The top of the window is now a grayer shade of orange, making it almost tolerable.
3) Autocorrect seems to be working across a wider array of apps. I only noticed it in TextEdit and a couple others in DP2, but with the update, it seems to be working in most of Apple's pre-installed apps.
4) Mission control now hides the thumbnails for spaces if you only have one space open. In this case, the viewing area for open windows is simply expanded to fill this space.
5) Scrolling up over an icon on the dock now shows open windows for that App (basically, this used to be the behavior of click-and-hold in Snow Leopard.) For some special apps such as TextEdit, it also shows a list of recently opened files (this feature was present in DP2, however.)
6) If you enable switching spaces using your keyboard’s arrow keys, the up and down arrow now enter Mission Control and Application-mode expose (similar behavior to what’s mentioned in #5 above), respectively. Spaces used to run in a grid in Snow Leopard, and the up and down arrows switched spaces vertically. Since Lion only allows horizontal space switching, I guess they repurposed the up and down keys.
7) Safari shows a button that opens the Downloads window. This button automatically appears when you have an active download. When the download finishes, the button automatically disappears.