Damn, this is actually amazing. I've always struggled with the fact that Typekit locks your font tests to Adobe apps and haven't wanted to pay up-front cash to try out a font. This looks like it solves font licensing for good (if they can get the font foundries on board), particularly for freelancers.
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Hunter
Fontstand is a Mac OS X app that allows you to try fonts for free or rent them by the month for desktop use for just a fraction of the regular price. One-click font activation for all your OS X apps.
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I've been using Fontstand since it launched. I've purchased several fonts for a couple projects and it is a fantastic service. The list of (growing) foundries is a who's who of amazing type designers.
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Yala Bella