And Now, A Few Shameless Plugs

Winamp... If you haven't used it, you haven't listened.
Litestep... If you haven't used it, you haven't been productive.
ICQ... If you haven't used it, you haven't messaged.
Netscape... If you haven't used it, you haven't browsed.
Adobe Acrobat... If you haven't used it, you haven't read.
WinZip... If you haven't used it, you haven't archived.
Total Annihilation... If you haven't used it, you haven't destroyed.
mIRC... If you haven't used it, you haven't communicated.
ZDtv... If you haven't used it, you haven't understood.
Redhat... If you haven't used it, you haven't multitasked