Google Desktop Beta 2 is slowing down my computer significantly, affecting web browsing, IE7 tabbed browsing, and Blogger's editor. It also hogs CPU and makes Outlook integration and IMAP usage very slow. While the What's Hot widget and Gmail integration are nice, the lack of UK news and email ordering issues are disappointing. I plan to uninstall it soon.
I've downloaded the Google Desktop Search 2.0 Beta and I'm liking it so far. My only complaint is not being able to force indexing when not idle. It seems to be lightweight, which is great for my computer. I've installed the Adsense plugin and the Gmail plugin is a plus. The feed detection is excellent, even better than IE7 Beta 1. I'll post more thoughts after I've used it longer.