I came across this while searching for Dollhouse related news; it looks like Amy may have filmed a guest spot on Private Practice for the upcoming season 2 premiere! It airs October 2008 — further confirmation of the actual date & time shall be added later on. I will also try to get hold of this episode when it airs for further confirmation, and to make caps & clips.
Rhimes says with the exception of David Sutcliffe’s return, there’s no big guest casting to announce. I beg to differ. I watched the premiere Tuesday night and I spotted Amy Acker!