Please see the updates below, depending on what version of iWOW you currently have—either the new iWOW 2 or iWOW 1:

iWOW 2 UPDATE (11/1/2007)—for iWOW 2 Users Only
This version of iWOW 2 fixes Leopard compatibility for iWOW 2 users.  
Click here to download the most updated iWOW version.

iWOW 1 UPDATE (11/1/2007)—for iWOW 1 Users Only
This version of iWOW 1 fixes Leopard compatibility for iWOW 1 users.   
Click here to download the most updated iWOW version.