If you're running WordPress its well worth doing the upgrade to 2.0.1! I just did it here this afternoon and it fixes a whole lot of issues I had with 2.0. The dashboard is now actually usable and doesn't crash all the time, performance seems to be way up, smilies are working, linebreaks in the WYSIWYG post editor are converted to linebreaks in HTML etc. Not sure what went wrong with my 2.0 install but it was extremely buggy to say the least and now I'm a happy camper again ;)
One annoyance I still have -- if you want linebreaks in comments to work you need to do a little workaround. Probably not the best way to do it but I added a nl2br to the return value of the "comment_text" function in "/wp-includes/comment-functions.php".