Cianer.com

World of Goo is a fantastic game so when I decommissioned my old Windows XP Pro laptop I wanted to move the savegame to the new Ubuntu laptop.  I didn't want to have to deal with Fisty's Bog again if I could avoid it.  Unfortunately the World of Goo save file, pers2.dat, was not where their F.A.Q. said it would be.  It didn't show up in an initial search of the hard disk either, which was weird.  I included hidden files in the search and it showed up in C:\Documents and Settings\%userprofile%\Local Settings\Application Data\2DBoy\WorldOfGoo\

Copied it to ~/.WorldOfGoo/pers2.dat in Linux & all was tickety-boo.  So basically if you are having trouble finding it enable "search hidden files & folders" in the advanced options of Windows search.

Update:  Someone already posted this on the World of Goo forum.