We all pretty much know how to do the ":P" and ":)" smileys, but there are more! I did happen to find a list of them for Wordpress blogs, and here they are:

:grin: :sad: :evil: :shock: :twisted: :???: :roll: :!: :mad: :?: :razz: :idea: :neutral: :arrow: :mrgreen:

Here is the code for each (minus the spaces):

Hopefully this was helpful!