i grabbed the Pink Floyd - Fillmore West San Francisco, CA 04/29/1970 show in mp3 last night using River Past Audio Capture v7.0.2.61002. then i used Adobe Audition to cut the songbreaks. the 2hr10min file is 298MB in all.
if you get the concert info from the site first you can schedule River Past to shut off at a certain point, next one i get i'll set it to shut off a couple of minutes after so there's less to trim.
here are a few links that i used to get the job done.
http://www.riverpast.com/en/prod/audiocapture/features/
http://www.riverpast.com/en/support/tutorials/ (bottom of page)
http://www.riverpast.com/en/support/.../install/lame/