I'm using phpmyborder and it's working well:
http://www.geehowquaint.com
The only problem i'm finding is that it's not always good at working out the correct height of the box, so the bottom part of the contents can disappear, requiring you to tab down to it to scroll the content up in the box. I can't work out how to fix this at the moment.
it doesn't happen often though
cheers
steve