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they're all hosted on wordpress.com, so you can use them 'as-is' if your blog is hosted on wordpress.com. if you're running wordpress on your own host, I highly recommend alex king's share this plugin, or the sociable plugin. (in fact, i grabbed the icons from these plugins). If you're not running wordpress, you must not be cool, and therefore, I cannot help you.

First thing, you'll want to grab the code. it's in this text file:
Social Bookmarking Template

Next, publish your post. Then open up the template in a text editor (Notepad on windows, textedit on mac). You'll want to go to Edit > Replace (or Find and Replace), and replace any instances of xURIx with the address of your post (this is why you had to publish it first).

Now do the same thing, and replace xTITLEx with the title of your post. You'll want to put + signs in place of spaces, though (e.g. social+bookmarks+on+wordpress.com) so that the links work. After that, select everything and copy it.

Now go back to your post and edit it. if you're using the rich text editor, you'll need to switch over to the (scary) code tab. paste all this at the end of your post.