Well, I've installed Karmic on four of my machines and it's running well. I don't like the way the new Grub2 looks by default and I'll be looking into customizing it's appearance. If anyone has any tips (like how to remove the memtest86+ entries) please let me know.
I also just installed Flock browser 2.5.2 by hand. I'm hoping the getdeb.net will soon start building packages for Karmic. This blog post is being composed in Flock on Karmic.