Nugs for a good listeing collection! All good quality MP3’s and soundboards. There are also some really really dodgy AUD’s on there, so be careful. Stream first for quality assurance:
http://stash.nugs.net/stash.asp?cmd=shows&artist=2
To start a legit collection for trading purposes though, you need to get a BitTorrent software client downloaded and start getting seeded shows in their SHN/FLAC formats in order to get the best quality sound and trading. All the deatils are here:
http://bt.etree.org/index.php?cat=5
Most legit traders won’t trade MP3’s or multi generation copies. It’s complicated but it keeps the trade pool clean.