Been looking at alternative font-replacement techniques of late, and have just received my beta invite to TypeKit.com. The idea behind their service, is that they host the fonts, you pay a monthly fee, and you can embed whatever font from their lib into your site via js and css. No flash/image/php replacement techniques, no hiding text off the page, it’s the font as you want it.
Even better, it doesn’t have banner ads.. (yet). Oh but it’s pretty!! Homepaged already.