eBay's latest move (effective 4/19/11) is to charge their standard 9% commission (for non-store sales) on the final selling price + shipping charges. Yep, you read it right! Now eBay is charging a commission on postage!!! The theory behind this move is that it will "incent" (eBay's word) sellers to offer free shipping. eBay listings with free shipping will presumably still receive a higher search ranking; this is something eBay claims to have been doing for awhile now.
Other than the potential better search ranking, 9% of a $10 selling price + $3 postage OR 9% of a $13 selling price (which includes free shipping) sounds like the same thing to me! It's still 9% of $13.
More info here:
Oh, and by the way, eBay has also been named one of the world's most ethical companies. Can you believe it? You can read about that here: