The WB.com officially launched as an online site Aug. 27, but now you can watch full seasons of "Veronica Mars," "One Tree Hill," "Babylon 5," and "The O.C." (Although it's Season 2 of "Veronica" and "Babylon 5.") TheWB.com also is offering a selection of full episodes, but not full seasons, from the following shows: "Buffy the Vampire Slayer" "Everwood" "Friends" "Gilmore Girls" "Roswell" "Smallville" "Angel" "Firefly" "In Living Color" "The Loop" "MADtv" ...