Why not just make the strip about the people on the forum? Make it a gag-a-day strip that's based around people talking to each other over computers. Make the characters either regulars on the forum or pseudo regulars on some fictional forum. Then whenever somebody thinks of a good joke in any setting, they can tell the joke under the idea that they're typing it online--either start or end the panel with the character typing at the computer, staring or ending the narration in computer text above the characters head. The nice thing about this style is most of the jokes, I would assume, told would be about the online environment that everybody here is familiar with.
As for artists, we could just have anybody who wants to submit their artistic rendition of people on the forum, and we'll take all the EUOLs and vote on them, all the Gorgons and vote on them, all the SEs and vote on them and use those images in the comics cut and paste style. After the vote is cast, the winning rendition will have to be done from the side talking and not talking, maybe walking from the side--just four or five basic poses. If you want more than the artist gave, then you'll have to request a new one and either he or she will have time to make a new one or not.