I have to admit these are not my creation, but I also can't remember where I found them.
 

PCMCIA	People Can't Memorize Computer Industry Acronyms
ISDN	It Still Does Nothing
APPLE	Arrogance Produces Profit-Losing Entity
SCSI	System Can't See It
DOS	Defective Operating System
BASIC	Bill's Attempt to Seize Industry Control
IBM	I Blame Microsoft
DEC	Do Expect Cuts
CD-ROM	Consumer Device, Rendered Obsolete in Months
OS/2	Obsolete Soon, Too.
WWW	World Wide Wait
MACINTOSH	Most Applications Crash; If Not, The Operating System Hangs
PENTIUM	Produces Erroneous Numbers Through Incorrect Understanding of Mathematics
COBOL	Completely Obsolete Business Oriented Language
AMIGA	A Merely Insignificant Game Addiction
LISP	Lots of Infuriating & Silly Parenthesis
MIPS	Meaningless Indication of Processor Speed
WINDOWS	Will Install Needless Data On Whole System
GIRO	Garbage In Rubbish Out
MICROSOFT	Most Intelligent Customers Realize Our Software Only Fools  Teenagers