1999-00-00 M2 was rebranded as MTV2.
1999-00-00 Starz! Kids (PAY) was launched (year unknown).
1999-00-00 Starz! 2 (PAY) was rebranded as, became Starz! Theater, then Starz! Edge on March 25, 2005.
1999-01-01 The Biography Channel was launched.
1999-01-01 DIY (Do It Yourself Network) was launched.
1999-01-11 CBS Eye on People was renamed Discovery People.
1999-01-15 VH1 Smooth was rebranded as VH1 Classic Rock.
1999-02-01 Prevue Channel was renamed TV Guide Channel.
1999-02-02 Noggin was launched.
1999-03-01 Nickelodeon Games and Sports for Kids was launched as its own channel, spun off from the Nickelodeon channel.
1999-03-17 NBA TV was launched.
1999-05-00 Starz! Cinema (PAY) was launched.
1999-05-00 Starz! Family (PAY) was launched.
1999-05-06 HBO Zone (PAY) was launched.
1999-05-06 HBO Comedy (PAY) was launched.
1999-07-14 The Military Channel (the first version) went dark. Discovery Communications filed a trademark application with the United States Copyright Office for the use of the name "Military Channel" in 2002. I'm not sure when that version of the channel signed on.
1999-07-14 TVG Network was launched.
1999-07-19 Fox's The Health Network was launched.
1999-08-02 XHTJB Channel 3 in Tijuana signed on.
1999-08-02 Discovery Health Channel was launched.
1999-09-00 Low Power Channel 23 in San Diego signed on for a month, then silent.
1999-09-00 Showtime Beyond (PAY) was launched.
1999-09-06 PBS Kids Channel was launched. It ran for six years.
1999-09-12 Fox Cable Network's Group purchased FitTV and merged it with America's Health Network, which was already owned by Fox Cable in a joint venture with Scott and Vandewater. The merged network was relaunched as The Health Network.
1999-11-01 Channel 49 Tecate signed on.
Source: The Cable Center website: Cable History Timeline: http://www.cablecenter.org/resources/exhibits/cable-history-timeline.html