You may find this collection useful.
http://www.virtualhosting.com/blog/2008/50-tools-and-resources-to-help-you-start-a-webcomic/ (http://www.virtualhosting.com/blog/2008/50-tools-and-resources-to-help-you-start-a-webcomic/)
An amazing compendium! I've bumped into quite a few of those in the couple months I've been working on my comic, and they've proven immensely useful. Based on that, I'll be checking out the rest of them.
Thanks!