MSNBC’s Countdown with Keith Olbermann disappeared from the airwaves after its Jan. 21 installment, so naturally, it disappeared from the rankings of top cable-news-show Web sites for the week ending Jan. 29 from Experian Hitwise. After topping the list the previous week, Countdown‘s cancellation left the door open for Fox News Channel’s The O’Reilly Factor to seize first place in the category, followed by two offerings from MSNBC: The Rachel Maddow Show, and The Last Word, with the latter representing Countdown‘s replacement.

The top two late-night talk-show Web sites were unchanged from the previous week — Comedy Central’s The Daily Show with Jon Stewart and The Colbert Report — but ironically, NBC’s The Tonight Show with Jay Leno bumped TBS’ Conan out of the No. 3 spot.

Morning-talk-show sites were unchanged yet again: NBC’s Today, ABC’s Good Morning America, and CBS’ The Early Show.

The top three broadcast-network sites also remained constant: CBS, ABC, and NBC. The same story applied to the top three broadcast-show sites: Fox’s American Idol, CBS’ NCIS, and ABC’s The Bachelor. Fast risers on the broadcast list were ABC’s Castle (to No. 14 from No. 27), NBC’s Who Do You Think You Are (21 from 80), and The CW’s Supernatural (24 from 53).

MTV’s Jersey Shore continued its rein as a blast in a glass atop the list of cable-show sites, and Comedy’s South Park held onto second place, but BET’s The Game was not game enough to remain in the top three, replaced by ABC Family’s Pretty Little Liars. Fast risers were FX’s Archer (13 from 114) and The Last Word (23 from 108).

When combining broadcast and cable networks, the top three shows were unchanged from the week ending Jan. 22: Nickelodeon’s SpongeBob SquarePants, Jersey Shore, and South Park. Fast risers were CBS’ Hawaii Five-O and MTV’s Skins (25 from 35).

Broadcast and Cable Report 012911