Best Bets on TV Tonight

Separated from the kids who invented them, imaginary friends can have a tough time. Fortunately, there's a place where they can stay -- and perhaps even find a new kid to live with in "Foster's Home for Imaginary Friends" (7:30 p.m., Cartoon Network)."Olympics Opening Ceremony" (8 p.m., NBC) offers the usual elaborate pageantry, this time in Athens. In addition to crowd-pleasers on tape in prime time -- with Bob Costas as host -- many events will be available live, sometimes at odd hours, on NBC's sister networks Bravo, CNBC, MSNBC, Telemundo and USA.
Set the VCRs for a rebroadcast worth seeing, as the American Film Institute celebrates the soundtracks of both classic and unexpected movies in "AFI'S 100 Years ... 100 Songs" (8 p.m., CBS). Interviews with Debbie Reynolds, Rita Moreno, Barbra Streisand, Marvin Hamlisch and Betty Comden, among others, offer insight into the tunes that enhanced so many films. John Travolta hosts.
After taking some real time off to let the political situation heat up, "Real Time with Bill Maher" (11 p.m., HBO) focuses an irreverent eye on the campaign through the November election.