I’m a big fan of Guy Kawasaki’s blog and that’s exactly where I first heard about MajikWidget. Basically the service gives me a free 25 credits, which I can use to create 25 widgets on various posts on my site, for instance a voting poll or a star ranking that can be used for people to vote on a product I’m blogging about.
It’s in use in my Borat post a bit further down on this page, here, here and soon in more places. After using those 25 credits I’ve gotta pay though. 500 credits costs $25 and 1000 credits costs $50. Seems a bit expensive for something like this, which I bet you can find plugins for, but not really that I know of, so for now this will be my solution now and then.