There is a multitude of web-comics that are crappy, and a few that are actually good. There are three that I read on a daily (or whenever they update) basis. Web-comics are one of my favorite ways to kill time inbetween experiments.
PhD – also known as “Piled Higher and Deeper”. This title is refering to the play on abbreviations that is commonly used by graduate students to describe their increasing knowledge gained from increasing degrees. BS = Bull Sh*t. MS = More Sh*t. PhD = Piled higher and Deeper. As indicated by the title, it is a comic about PhD students at Stanford University (or any university). I enjoy this comic because it hits a little too close to home at times. I reccomend going to the new to Phd section and reading the top 20 comics first.
xkcd – This is a comic that is heavy into math and computer science. Many times have I asked Jack to explain why a particular strip is funny. Where would I ever learn about Hidden Markov Models?!? Every now and then there is a comic about science in general; those make up for all the ones I don’t understand. I reccomend hitting random comic for the most enjoyment.
SinFest – This is a comic that is constantly making fun of the right and left wing of politics and religion. Every now and then, it is lightened up by a comic about a cat and dog that live together. Most of the strips in this site are long sequences that go for many days before the whole story is finished. I reccomend starting from the beginning and going from there.