:-) Your basic smiley. This smiley is used to inflect a sarcastic or joking statement since we can't hear voice inflection over e-mail.

;-) Winky smiley. User just made a flirtatious and/or sarcastic remark. More of a "don't hit me for what I just said" smiley.

:-( Frowning smiley. User did not like that last statement or is upset or depressed about something.

:-I Indifferent smiley. Better than a :-( but not quite as good as a :-).

:-> User just made a really biting sarcastic remark. Worse than a ;-).

>:-> User just made a really devilish remark.

>;-> Winky and devil combined. A very lewd remark was just made.