:S is confused
:D is laughing
;) is winking
:o is shocked
<3 is a heart
:( is unhappy

and we voted }:[ to be a vampire in a link
that's all i can think of off the top of my head

xD & XD are excited or laughing
D: is like a "oh no" kind of thing, lol, or "argh!"
:\ & :/ are confused
:'( is crying
^_^ is "aww" or just a cute happy (this one comes more from the Japanese smilies though which are more bigger and such)

interesting i don't think i've ever seen D: well you know what they say you learn a new simlie every day

indeed :) i often use it as my "oh noes!!" thing

:#) = smiley with moustache(maybeastarbucks taught me that one)