I’ve installed two new plugins that are Ajax based.

Ajax Comments
Great plugin that takes the refresh out of adding a comment to the site. It simply accepts the comment and adds it to the list without ever changing screens.

Ajax LiveSearch
This replaces my default search box with a live search box. Start typing and it’ll automatically show you results. I think it has IE issues, but works great in most browsers.

I also had to get rid of Spam Karma and go for Akismet as Spam Karma and Ajax Comments didn’t play well together. Either way, I should have excellent spam protection.