If you're a Twitter user, got a WordPress blog, and would like to throw in some interactions between those two, don't miss this plugin: Twitter Connect. Using the brand new Twitter's OAuth API, this plugin lets you identify yourself using your Twitter account.
I like it for several reasons: it's cool, it's quick, and it opens the door to getting more information from your commenters. Right now it gets one's Twitter avatar and use it like a Gravatar, but I'd hack it so it would display a link to the Twitter profile and show commenter's latest tweet just like some plugins add your latest blog post. I also think that Twitter related blogs (such as Twitip) could enforce using this as a probably very effective anti spam method.
I like it. I'm putting it on top of my "plugins to install" list. Found via @joetek.
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