My rating system is quite rigorous:

A - Excellent SBD quality recording
B - A very good sounding audience recording
C - Nice sounding recording - instruments may sound wierd, a little noise in the background
D - Heavy noise in the background, still actually enjoyable for a fan
E - Only for collectors...

- no writing on the surface of the discs
- preffer non-lossy formats obviously
- send the discs in a safe way
- be kind ;)

Can't think of any more rules, I guess they're quite obvious though.

NOTICE: there are shows in my collection that are SBD quality even though they're not marked so here.

Setlists to all R.E.M. shows can be found here: http://www.remtimeline.com/