For designers and anyone interested in typography on the Web, I highly recommend you check out Web Font Specimen and the A List Apart article “Real Web Type in Real Web Context” that explains it. As we near a point where real typographic controls and options are available to us, its pivotal time for professionals to step up and gain (or remember) skills that haven’t been of use on the Web. The gap between good and great designs and designers will grow and the differences will be much more apparent at a glance and in the details.
If you haven’t had a chance to play with Typekit or learn about the various font embedding options (see The Potential of Web Typography: and Bulletproof @font-face Syntax) recently layered into browsers, now’s a good time to fatten up a few brain cells.