Typography is a vital part of any Graphic Design composition. Knowing basic and advanced techniques of kerning, leading, typeface use, contrasting typefaces (serif/sans, weights, etc.), sizing, arrangement, alignment and various other parts that make a successful design. For me, kerning is something that is always tricky, even when you 'optically' align the text on a project. Manual kerning is a great skill to have and very important so you don't look back on something and have it stick out like a sore thumb.
I have seen this site a while ago, but it came back up in one of my subscribed design blogs. Kern Type is a site that quizzes you on your ability to properly kern the word displayed. This fun game of kerning different words allows you to see your accuracy and displays the percentage of how well you did. Each word that appears also shows the font, typographer, and the year the font was created, which gives you some typeface knowledge for later use or sparking an interest to find out more about the typefaces! And they made this site multitouch friendly for all you iPad owners.
I personally learned a few things from the tricky character shapes in some typefaces of different words. How did you do?