As I've begun converting HTML documentation into wiki form, I found I was unable to use wiki markup in table cells. In order to properly convert the documentation, I dug into tikilib.php and added an additional form of tables using ||| for the table beginning and ending. I've attached the changes here. They're useful to me, and they may be useful to others...
|||row1col1|row1col2||
!A heading in a cell|
* A list
** A list in the cell
Monospaced||
row3col1|row3col2|||