Someone is starting up an Invader Zim webcomic here:
http://zim.snafu-comics.com/ it's just the cover for now but in the meantime check out two of the other comics on the site, the Powerpuff Girls Dojinshi (trust me it's good):
http://ppg.snafu-comics.com/ and the more often updated, since PPG is on hiatus, Grim Tales From Down Below:
http://grim.snafu-comics.com/ It's great to seee all the cartoon network characters redone and given real stories and so on, Helga Pitaki as a truly hell-worthy tutor anyone?