I am a proud owner of a Pandora (or will be in a few weeks) and we, the customers, have heard there's a good chance of seeing World of Goo available on our powerful little handheld. I am ready to buy the Wii version, but I want to be sure I won't have to buy the same game twice.

Is there any way I can have my license transfer across multiple platforms?

only Windows, OS X & Linux.  Everything else is seperate.  I also think that's only if you buy from the site.  if you buy a retail box it's Windows (maybe mac too) only.