Since sleeveless sweater-vests don’t appear to be making a comeback, one of the most protective devices for a notebook computer is arguably a notebook sleeve. Shinza sells the ZeroShock, with available sizes ranging from 11- to 17-inches; plus you can choose from a variety of colors so you don’t make a fashion faux-pas.
Shinza indicates that these cases are made from "high-resistance polyurethane foam that provides superior absorption of external impact force". While it sounds like my MemoryFoam pillow, these cases compress and expand back very slowly. Shinza even shares some "shock test" results indicating how these cases can withstand up to 100G’s more impact than other notebook sleeves. Funny, no comparisons against those sweater-vests. Case prices start at $29.95 direct; tack on $5 for the larger or widescreen sleeves.