In Tag&Rename 2.0.5 click on Tools->Get album titles from www.allmusic.com then follow the instructions.
It's not fully automatic and sometimes allmusic.com doesn't have the exact # of tracks that you have ripped from CD. If this happens you have to juggle things around a bit and sometimes enter the occasional track name manually. It's still better than manually entering everything in T&R from scratch but I usually just re-rip the CD with EAC instead and let EAC populate the tags for me.