Yep. My coauthor and I did a Pretender/DS. I'm getting her into DW with me, and we're already playing with sticking the Doctor into some of our other stuff, including (probably never posted, but it's fun to toy with) her Supernatural series. I'm also playing with a DW/Tin Man and a DW/TW, but first I've got to get through my LOTR/NCIS.

Are you ready to have me committed yet? ;)