Subnormality
Subnormality is almost definitely my second-favorite web comic out there, and is fast gaining on XKCD. Any of you who consider yourself writers by hobby should definitely read the latest one.
(Warning: the comic's tagline isn't kidding when it says, "Comix with too many words since 2007".)
Here's another good one.
(Warning: the comic's tagline isn't kidding when it says, "Comix with too many words since 2007".)
Here's another good one.

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Pouches 110
Feet 101: How to Obscure Them
Spinal Contortion Independent Study
Firearms 210 - Drawing Them In Later
Muscles Definition: Special topics - Muscles growing out of muscles
Feet 102: En Pointe (Completion of Feet Series)
Pouches 210
Facial Structure 314: A Cursory Examination of Your 200 Teeth
Pouches 315
Pouches 420
Pouches Independent Study
On the plus side, enrollment costs are low, because they never have to pay for models.