Now TiVo has signed a deal with Nielsen.

Definitly a good thing. Gives Neilson a much wider data source, and a more natural input. The Tivo I think has gained enough acceptance, that with the combination of real Neilson boxes, should give a more accurate picture of what people are watching. And, without a specific Neilson box sitting there, people are less likley to try and taint the data.