[faragon]

Just put the entries in the "hosts" file at router-level (e.g. using OpenWRT).

[cptskippy]

And duct tape said router to your laptop so you can take it with you every where you go?

[Spivak]

Running a local dnsmasq server is effectively the same thing.

[cptskippy]

Yup. You could also use something like PeerBlock which gives you a little easier control.