I've spent the last three days writing personal e-mails to all my medievalist friends inviting them to submit a project to Witan (or get involved as a peer reviewer or booster), and I'm still only through the letter D.
If I've learned nothing else through this process, it's that I've got a lot of medievalist friends! It's a lot like sending out wedding invitations -- I just know I'm going to forget someone important, and since I'm using my e-mail, those who are Facebook friends but not in my e-mail contacts might slip through the cracks.
It's been heartening how many have replied with ideas for texts, but if you've already got a substantial amount written (at least one chapter or the equivalent), a personal e-mail to me isn't enough -- you're going to have to submit your proposal through our Submissions page, for reasons both bureaucratic (so our other editors get to see the proposal) and political (so hiring and tenure & promotion committees see it's all legit).
It's been exciting to see how many of you all are excited! There will be some bumps and snags at the beginning (for example, our submissions page stopped working for a few hours on the first day), but we're pushing the frontier of medieval scholarship. In five years time, I'd like to see this e-pub medium be the new normal for disseminating scholarship.