I've got one too which I took the HD out of because it was noise and probably about to fail. I've not used it for a while, but just set it up to boot from ROM.

It does indeed seem to have AppleShare built-in. I didn't try to mount a share and test the speed, as I didn't want to fork up the network settings on my other (ethernet) Macs, but it really makes you wonderwhy Apple didn't include something like this on more models...