We recently sent a prototype Small Cafe Bag with a built-in padded pocket (a bag design similar to the Ristretto) sized for the EEE PC to forum member cwhit for testing. You can view her pictures of the bag (and read her comments) here. (That link goes to a Flickr photo set that cwhit posted in this thread.)
As for a Brain Cell: with something as small (and inexpensive) as the EEE PC, would you still want the protection that the Brain Cell provides?
Tom is designing a new type of Soft Cell for the MacBook Air, and I think this new type of soft sleeve would be what we would offer for the EEE, too.