It's compatible up to 2.5.1 release, don't bother upgrading to wordpress 2.6 there are a TON of errors / bugs on it lately. So stay with 2.5.1
http://wordpress.org/extend/plugins/sociable/
K, as the name suggests, it allows your readers to bookmark the particular page they are reading, there are like 93 at present count to choose from.
You can add the social bookmarking icons to any page, including the rss feeds too, which is a bonus when you end up submitting your rss feeds out to rss feed directories.
Add something encoraging at the configuration, by default it says "Share and enjoy". I've changed mine to reflect an instruction.
It's pretty straight forward, no pages to edit, plug-in and play sorta plugin.
Enjoy!
I'll be back throughout the day posting more plugins that I think will help you out, I'm in the middle of working with my programmer for Article Blog Poster release, which wont be long.
I just need to set up a few blogs for testing and adding plugins for each one that will be used.
