As far as internet comedians go, The Oatmeal is easily one of my favorites. I started going to the website for the grammar and stayed for the ridiculousness.
The Oatmeal combines silly cartoons of dinosaurs (and other, non-extinct, animals) with intelligent observations on life. I mean, the guy made a guide on how to pet a kitty. And it's completely accurate. And hilarious! Outside of grammar my favorite comics are called Minor Differences. I look at them at work sometimes and have to try very hard to not literally lol (Part 4 is my favorite).
Also, I found out The Oatmeal is a runner. And not just the I'm-gonna-take-a-quick-jog type of runner. He ran a 50 mile ultra marathon. Through mountains. That's hardcore running.
So not only is The Oatmeal a funny and insightful comic, but he brings awareness of our wonderful language to the masses (if you use the wrong you're/your on Facebook you better believe I'm judging you) and he's apparently a very active person. Props to you, Mr. Oatmeal. And please post things more often.