Wiki formatting class or something similar

Hi everyone, I allow my users to put some Html into their blogs. I filter it using a great tool called HtmLawed and written by Dr. Santosh Patnaik (if you're reading this, many thanks to you!). However, I would like to give them a possibility to mark-up their text in a more convenient way for beginners (such as Wiki or something similar). I searched through http://phpclasses.org/ but didn't find anything. Could you suggest me something? And one more question: maybe some of you already have a handy solution to process smilies? Say, a user writes ":)" and this is replaced by an image in my directory. Thanks in advance! -- With best regards from Ukraine, Andre Skype: Francophile Twitter: http://twitter.com/m_elensule Facebook: http://facebook.com/menelion