I think the first time I ever saw an online proposal was when Gabe of Penny Arcade did it.
And while technically Greg Dean didn't do it the same way (proposed first, asked question later) I'm beginning to wonder if a trend is beginning to develop.
Regardless, something to keep in mind for those of you who are dating webcomic artists, since it's something that's highly likely to happen if you're dating one and one of them proposes. ;)
Oh and I forgot. Congratulations to Greg and Liz are in order ;)
