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Add me to the list of folks without cable, we cut that cord about a month after getting our 2 ATV's.

Have my DVD collection (movies and TV shows) in iTunes so we use the ATV's to steam those. Watch Netflix a lot. With HULU+ now (still trying to decide if we have a use for that). Plus YouTube and photo stream. We love it, i use my EyeTV to record all of the network shows we watch and then stream this through iTunes as well.
 
iTunes Streaming from my iMac, Music, Movie Rentals, Netflix, Hulu Plus although I let that expire Netflix is way better. It sometimes gets more action than my DirecTV box. If it wasnt for sports and HBO I would kill off DTV.
 
1. NHL Game Center
2. MLB.tv
3. Apple trailers :)

Most of my blu-rays are ripped at high bit rates and hi def audio (i.e. TrueHD / DTS MA) so the ATV 2 cannot do those so they go through the XBMC based HTPC.
 
Another one who cut cable and sattelite several years ago for Apple TV.

1) TV show season subscriptions
2) Movie rentals
3) Movie purchases
4) MLB TV
 
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