Finally I had enough time to continue working on the star rating plugin, and here is the first, still alpha version you might wanna try. Currently plugin allows you to set up voting system. All votes are saved into database, so when you update plugin in the following days, all votes will be saved.

Plugin has protection against search spiders. Also, votes are saved based on user id if user is logged in, or visitors ip and cookie if not. You can set if you would like to allow non users to vote or not.

There are still a lot of things missing. I am planning to add sidebar widget, voting control and statistics and new stars styles. So, you can see how the plugin looks like on this blog, and I hope you like it. And, all suggestions and comments are welcome.