Jim Roepcke's observation about CSS support in Frontier/Manila/Radio is IMHO right on the mark. It's partly (even mainly) a legacy issue. The CSS purists are overlooking the difficulty of taking pre-CSS design decisions. Hindsight has 20:20 vision ;-)

Jim, aslo has some good links in that post. Like Jim, I'm thinking of CSSifying my website(s). But will I be prepared to compromise the look and feel by doing so? I guess it depends on how gracefully the CSS I use degrades in older browsers.