I can’t remember where I found the link to this, so please forgive the lack of attribution. Bullet-proof rounded corners gives an excellent guide to making cross-browser compatible rounded corners using just CSS markup instead of old-fashioned tables.
I’m planning a couple of design changes to this blog, and rounded corners may well make an appearance in the new version. Certainly they’re going to appear in the next version of the AmphetaFrames templates. (Which are being worked on, albeit slowly and irregularly.)