Satya Meka has a free New AE Plugin: "BAD TV" Distortion. It's a Mac-only Core Image filter ported using Effect Builder AE. Windows users can request a Pixel Bender port (already in development) or try out RGB Sine Distortion by Synja Dev Blog. Here's sample render of bad TV from Satya:
Update: ProJuice has a tutorial, Bad TV, on how to manipulate the settings in the default Bad TV Effect in Final Cut Pro and create an original rolling analogue TV effect.