Using TopoR with EagleCad
Pretty interesting.  Every auto router i've ever used has been terrible with anything but the simplest boards, including OrCad and Altium (tho i love Altium for a lot of other reasons).  This looks like it may be worth playing with.

Anyway, according to their website:

"TopoR supports standard Specctra DSN/SES interface that most CAD systems have. Also TopoR can import/export P-CAD and PADS ASCII formats."

I don't think eagle supports Specctra DSN/SES, at least last i knew, so you may be out of luck.