SICP Editions

http://en.wikipedia.org/wiki/SICP
SICP Edition 1: 1984-1985. Out of Print.
SICP Edition 2: 1996. Softcover/Paperback & Hardcover & Cloth(WTF?).

SICP Edition 1(WHAT KIND?!): ISBN-??(10): 0-262-01077-1 & ISBN-10: 0070004226(McGraw-Hill).
SICP Edition 2(Softcover/Paperback): ISBN-10: 0-262-51087-1 & ISBN-13: 978-0262510875.
SICP Edition 2(HardCover): ISBN-10: 007004846 & ISBN-13: 978-0070004849.
SICP Edition 2(HardCover/Cloth(WTF?)): ISBN-10: 0-262-01153-0 & ISBN-13 978-0-262-01153-2.

Help me /prog/, I'm confused. There are two editions of SICP?
Is http://mitpress.mit.edu/sicp/ Edition 1 or 2?

>>2
Anrold Abelson and
Gerald Jay Sussman.

I don't see the relevance.