ezSpace UFO Surge Protector
While the ezSpace UFO is not as pretty as the Belkin Concealed Surge Protector, it does allow for surge protection to six large wall warts in a very compact space.
Instead of stretching out, the UFO orients your plugs vertically. To make sure those hefty wall warts stay in, ezSpace has oriented the plugs on a slight angle so that gravity holds them in instead of pulling them out.
Available here for $28.99.