Talk Blogging

I have a wordpress.com blog, not hosted in my own server but using the one from the site. I want to add a few tools like maps, stat counters etc but i read that wordpress.com allows limited use of these features and most plugins are designed for the blogs you host on your own. Can anyone suggest a few tools/plugins for wordpress.com, even if they have to be implemented using widgets? Do these plugins work on blogger too?