Though now I am not using any widget or plugin to share content but if you want some easy to use Sharethis type alternative then check out these websites:
Add This Bookmark Widget
AddThis is an elongated social bookmark widget that can be placed on any blogging platform such as blogger, wordpress or on your myspace profile. Add this supports 60+ sites allowing the visitors to print an article too. Easy to use and loads quite quickly.
Just select the blogging platform, choose the type of widget you want and grab the code. You can add analytics tracker if you want.
E-mail It Bookmark Sharing
With E-mail it you can add same little widget to your website, this service which is of course free to use, supports 80+ website bookmarking. Add your domain name and grab the different widget styles, which are quite similar to share this and there is no need to signup for an account at E-mail it. You can track (optional) by providing your Google analytics code