Zara abducts the lovely Laura from The Bag Lady to review a handful of the coolest cases they could find.
Electric Baby-, blue bag from $42.50, cord case $12, sweater sleeve from $28
Laptop Stuff- Metstyle bag, £34.99, Melissa Beth bag, £107, Celly Meimei, £29.99
Sony Style--Disney bag, £24.95

it's not crumpler, it's celly! :)
I recently looked for an ultralight backpack (why have a 3-lb computer and 5-lb laptop case?) and found this ultralight 14-oz (!) backpack - I love it:
http://www.stationstops.com/2008/03/23/choosing-a-commuter-briefcase-or-backpack-for-the-train/