An issue I have been having with the share buttons:
When using the counter style and using dynamic parameters on the URL, I was using the Facebook, Twitter, and Google Buzz counters - but could only get the Google Buzz to work correctly.
While all three counters look good, clicking the Facebook like will result in showing a like for every single item. So, going to "(url)/example.php?id=1" and "(url)/example.php?id=2" will both show the 1 like. When tweeting, the tweet goes out fine - but upon returning to the page, they twitter count always gets reset to zero.