I recently upgraded to a red leather one from my grad school-ish ballistic nylon rolling bag. I've been impressed that laptop bag designers have finally figured out that us working moms want professional, feminine and functional -- all in the same business laptop bag!
The rolling feature makes my laptop bag a prize possession. With my 3-year-old on one hip, I don't need to throw out my back lugging a laptop plus accessories back and forth to work on my other hip.
NOTE: Officially, and as reported to my chiropractor, I never put my 3-year-old on my hip. (yeah, right!)