EU - Extended or Expanded universe
a.b.sw - the alt.binaries.starwars newsgroup
abs - as above
PM - Private Message (needs to be enabled in your profile)
PiF or PIF - Pay It Forward. A distribution method
B and P - Blanks and Postage. Another distribution method
HS - Holiday Special
SL - Single Layer aka DVD5
DL - Dual Layer aka DVD9 (also used to mean Download
XØ - A Pioneer HLD-X0 Laser Disc player