This is a collection of <a href=http://www.boardgamegeek.com/>BGG</a> tools by <a href=http://matthew.gray.org/>Matthew Gray</a>.
I've got a bunch of others <a href=http://www.mkgray.com:8000/bgg-tools.html>over here</a>.
More coming, but for now:
<ul>
<li><a href=/compare>Compare BGG collections/ratings</a>
<li><a href=/playedfeed>Generate an Atom feed of games played for a BGG user</a>
</ul>