Xbox 360: number sold as of Nov. 2010: 21.9M in NA, 45M worldwide (source: NPD)
PS3: number sold as of Sept. 2010: 16.6M in NA, 41.6M worldwide (source: Sony)
Roku: expect to reach 1M sold by end of 2010 (source: Roku)
Netgear Roku: number sold to date, too early to know
Apple TV: number sold as of December 2010: 1M (source: Apple)
Sony Netbox: number sold to date, too early to know
Boxee: number sold to date, too early to know
Logitech Revue Box, Sony Internet TV: number sold to date, too early to know
WD TV Live/Live Hub: number sold to date, no data released. I estimate less than 2M combined
TiVo: number sold to date: I estimate 750K TiVo HD units (source: estimate based on TiVos subscriber #s of 1.4M)
Broadband enabled TVs: iSuppli predicts almost 23M by 2013, TDG predicts 43M by 2014, DisplaySearch predicts 31M by 2013, Samsung predicts 20M by 2012
Broadband enabled Blu-ray players: as of October 2010, the total installed base of Blu-ray Disc playback devices in the U.S. was 21.1M. What percentage of those are "broadband enabled" is not known.