ABC's "This Week" — Commerce Secretary Carlos Gutierrez; Sen. Robert Menendez, D-N.J.; former Gov. Jim Gilmore, R-Va.
CBS's "Face the Nation" — Sens. Carl Levin, D-Mich., and Jeff Sessions, R-Ala.
NBC's "Meet the Press" — Gov. Bill Richardson, D-N.M.
CNN's "Late Edition" — Pakistani Prime Minister Shaukat Aziz; Reps. Charles Rangel, D-N.Y., and Duncan Hunter, R-Calif.; Sen. Joe Biden, D-Del.
"Fox News Sunday" — Former Gov. Mike Huckabee, R-Ark.; Sens. Arlen Specter, R-Pa., and Kay Bailey Hutchison, R-Texas.
I'm pretty sure Meet the Press has had every presidential candidate who has been on so far come on solo... except Chris Dodd, who was paired with Newt.