Gonk and Jack Skellington costumes from i09's costume roundup.
And a few more links:
1. Character design and storyboards for a One Laptop Per Child ad.
2. Lego Batman costume.
3. Janosz Poha and more ghosts from Ghostbusters.
4. Ghostly Lego minifig.
*Previously: Long essay explaining OLPC's failure.
*Buy Lego Batman minifigs at eBay.