Mark Hope
Hero
While Keep on the Borderlands is a fine module (I'm running it at the moment for my kids), I think that WotC's time would be best spent on converting a different module. After all, almost all of the creatures in KotB are basic creatures appearing in the Monster Manual and most of the other elements are equally basic, allowing them to be converted on the fly without any real hassles. Tomb of Horrors had several elements that needed work to update to 3e - the same is not true of KotB imho.