I've just released my first plugin - My Foursquare. It would be great to get some feedback. Thanks!
My Foursquare makes it easy to show off your Foursquare badges and mayorships on your WordPress blog. My Foursquare is also available as a Facebook app and an embed code so you can use it on any website.
My Foursquare shows up as a widget in your WordPress sidebar. You can customize the widget to display your badges, mayorships, last checkin venue, and a map of your last checkin. The widget automatically uses the same font and colours of your blog.
More info here: http://myfoursquare.net/wordpress