For those of you considering Leopard and using iPhoto 7 (iLife ’08), BetterHTMLExport 2.3 has been tested and qualified for the new cat.
For older versions of BetterHTMLExport, that require older versions of iPhoto, I would suggest upgrading to iPhoto 7 because it is designed to work with Leopard and Time Machine, not to mention the other niceties the upgrade offers.