WHO CAN LOG ON
Subscribers to Comcast's digital cable and broadband.
WHAT YOU GET
Nearly 20,000 TV shows and movies from two dozen channels, including HBO, Discovery, AMC, FX, and NBC. With clips and trailers, the catalog amounts to 80,000 videos. As Comcast cuts deals with other programmers, more content will become available.
WHERE YOU SEE IT
Subscribers can use the service on three PCs and open secondary accounts for their kids; eventually XFinity will be available on smartphones and tablet PCs.