It's a perpetual, one-sided comic strip. Video and more info here
HowToons is/are great at using simple, visual methods to explain how to build things. Blunder Lab take sthe same methods to explain basic scientific phenomena. While the artwork isn't as polished as HowToons, Blunder Lab still manages to fill a void.
There are lots of comics on the Web these days and most of them stink by all measures. A few stand out however, and one of the exceptions is Edmund Finney's Quest to Find the Meaning of Life.
While most comic strips, especially the ones in newspapers, have setups similar to TV sitcoms (a family or group of friends always siting on the same couch or eating at the same table), Edmud Finney is a very dreamlike adventure, with the protagonist going from one strange scene to the next, interacting with odd characters. This change in format opens up many possibilities that static scenarios cannot. Also, it's genuinely funny.
Cartoonist Adam Watson is imagining what a Dr. Seuss Star Wars would look like.
Another strip in the mnftiu style where existing drawings are used instead of original drawings.
This is the most educated comic series I've ever seen. Few places have Nikola Tesla and St. Francis of Assisi conversing on the same page as spoofs (spooves?) of Jane Austin, Shakespeare, and Euripides.
Kate Beaton also has a wonderful style and inking quality that makes even the less-funny strips nice to look at.
One of the best qualities of the strips is the voice. For most comics, reading them in your head sounds very flat, where Beaton's characters seem very real. I can hear actors saying the lines when I read them.
A fun web-toy is The Hero Factory where you can create various superheroes.
It claims to make a superhero version of you but I don't think the guy above looks anything like me.
The style is quite good though.
xkcd is a webcomic that has been around for a number of years and Randall is posting his 700th entry this week.
It's the only comic I read now. The ones in the paper (on the rare occasion [less than once per month] when I read a newspaper) are embarrassingly unfunny, as are most web-only comics. But xkcd has moments of insight - and is perhaps the only heir to the long-lost and Calvin & Hobbes in terms of its mix of intellect, humor, and sentimentality.
But some great ones are almost more like HowToons than comics:
It's not for everyone, and some of the nerdier strips require information that I don't, and won't ever, have - but it's worth checking out.