I was going through the release notes for Summer '09 and pulling out my favorite developer highlights for a new blog post. Halfway through the post I found an existing wiki page with roughly the exact same information I was writing. Since I am essentially lazy, I'm just going to link to this page instead: About the Summer '09 Release.
They did however forget Batch Apex... not sure how though....??
There's alot of good stuff coming in Summer '09!