What does all this NM, VG+ stuff mean?

The Goldmine Standard Grading System is as Follows:

Mint (M)

CD

Perfect. No scuffs/scratches, unplayed – possibly still sealed.

Insert/Inlay/Booklet/Sleeve/Digipak: Perfect. No wear, marks, or any other imperfections – possibly still sealed.

Near Mint (NM or M-)

CD

Near perfect. No obvious signs of use, it may have been played – but it has been handled very carefully.

Insert/Inlay/Booklet/Sleeve/Digipak: Near Perfect. No obvious wear, it may have only the slightest of marks from handling.

Very Good Plus (VG+)

CD

A few minor scuffs/scratches. This has been played, but handled with good care – and certainly not abused.

Insert/Inlay/Booklet/Sleeve/Digipak: Slight wear, marks, indentations, it may possibly have a cut-out hole (or similar).

Very Good (VG)

CD

Quite a few light scuffs/scratches, or several more-pronounced scratches. This has obviously been played, but not handled as carefully as a VG+.

Insert/Inlay/Booklet/Sleeve/Digipak: More wear, marks, indentations than a VG+. May have slight fading, a small tear/rip, or some writing.

Good (G), Good Plus (G+)

CD

There are a lot of scuffs/scratches. However it will still play through without problems. This has not been handled with much care at all.

Insert/Inlay/Booklet/Sleeve/Digipak: Well worn, marked, more obvious indentations, fading, writing, than a VG – possibly a more significant tear/rip.

Poor (P), Fair (F)

CD

The CD (if it is included) may or may not play some or all of the tracks. See the comments for details.

Insert/Inlay/Booklet/Sleeve/Digipak: Very worn. It may have obvious writing on it, it may be ripped/torn, or significantly faded, or water damaged