The Font Shop plug-in allows trying before buying. According to the FS webpage, “The FontShop Plugin Beta allows designers and other type enthusiasts to try out FontShop fonts directly inside Adobe┬« Photoshop┬« CS5 and CS5.5. You can preview any of the over 150,000 FontShop fonts for free, in the context of your own artwork. This is a great new way to find the perfect typographic fit for your project.”