someone once told me there is a long set nicknamed "Welcome to the Thunderdome"...was that the 3+ hour Bonnaroo set? help?
um... I think you're a bit confused.
Their 04 performance is referred to as "return to Thunderdome" because of the thunder rolling in during the performance and Jim says "this is 'Return to Thunderdome!'". It is available for DL (not free but worth the money) here:
http://stores.musictoday.com/store/product.asp?band_id=741&dept_id=7523&pf_id=FEDD49&sfid=2
For free, but not as good quality here:
http://www.archive.org/details/mmj2004-06-12.shnf
However, that set it short. Even shorter than it was supposed to be due to the rain. They played a 3+ set in 06. It can be found here:
http://www.archive.org/details/MMJ2006-06-16..4011s
thanks!