well, there's also
TTFN: ta-ta for now
TTYL: talk to you later
BTW: by the way
IM(H)O: In My (Humble) Opinion
AFAIK: as far as i know
IOW: in other words
(and, btw, i'm told some people use <eg> for "embarassed grin," rather than "evil grin." some people are odd...
)
then there are the FoLC-specific acronyms like...
FoLC: Fan of Lois and Clark
WAFF: warm and fuzzy feeling
WHAM: varies, but i think Wrenching, Heart-wrending, Agonizing Moment is more or less accepted
anyone else got something i'm forgetting?
Paul