They (and other useful things) are described in the UBB FAQ (see the link near upper left-hand corner in most pages. A link to a more complete list of smilies is visible only when you are composing a reply - see "Smilies Legend to the left of the reply field.
"I'm not back." - Bill Harding, Twister
I’ve looked at a lot of different solutions, and in my humble opinion Aspose is the way to go. Here’s the link: http://aspose.com