There is no better resource for learning how to draw cartoon characters than Preston Blair's Animation (Book 1).  The first edition of these books contained a number of well known characters that were used to teach aspiring artists how to draw.  Unfortunately, subsequent editions had to be redrawn using generic characters after studios like Warner Bros. sued for copyright infringement.  Thankfully, the ASIFA-Hollywood Animation Archive has found a copy of the first edition, scanned the book, and made them available to everyone on the internet.  The book has been posted in two parts.  Be warned: each page contains a number of very large images and takes quite a while to load, even over broad band.

If you're looking for another site to help teach you how to draw, take a look at all kinds of stuff.  The author, John Kricfalusi, has lots of great examples of fantastically drawn cartoons throughout history.