Warren Ellis is calling for submissions for a feature on his blog called Three Panels Open. There are only two rules: 1) It has to be three, not-previously-published panels; and 2) it has to be legible at a width of 640 pixels. Panels can be side-by-side, like the PJ Holden example above, or stacked on top of each other.
It's an ongoing feature, so there's no deadline, but Ellis will only be running his favorites. He'll also include links to other work by the contributors, so it's a great opportunity for under-appreciated comics-makers to reach a wider audience. It's also going to be fantastic for comics readers who enjoy short, outstanding work.
(via The Comics Reporter)