It looks like there's (very preliminary) GPS support in the
latest rootfs, thanks to phh and jonpry. AGPS support is not there yet, so it might take anywhere from 3-20 minutes to get a signal lock.
Replace the rootfs.img in your andboot folder with the linked version. You might also need to update to the newest kernel from Glemsom's site.
I haven't tried it yet, so I can't tell you much.