"Walkabout" has been used as titles for episodes of MillenniuM and Lost, both of which star Terry O'Quinn.
"Covenant": MillenniuM, Star Trek: Deep Space Nine, Smallville, Stargate SG-1
"Destiny": The Dead Zone, Angel, Star Trek: Deep Space Nine
"Goodbye to All That": MillenniuM, Terminator: The Sarah Connor Chronicles
"Lockdown": The 4400, Lost, Stargate SG-1, Smallville
"Graduation Day": The 4400, Buffy the Vampire Slayer, X-Men
"No Exit": Supernatural, The 4400, Battlestar Galactica
"Crossroads": Battlestar Galactica, Jericho, Stargate SG-1
"Babylon": Carnivale, Stargate SG-1
"Day of the Dead": Carnivale, Babylon 5
"The Hunting Party": The Dead Zone, Lost
"Descent": The Dead Zone, X-Men, Stargate SG-1, The Outer Limits, Smallville
"Many Happy Returns": Eureka, The Prisoner
"Blink": Eureka, The 4400, Doctor Who
"Revelations": Battlestar Galactica, The Dead Zone, Buffy the Vampire Slayer, Babylon 5, Stargate SG-1, The X-Files, Gargoyles
"Vortex": Smallville, The Dead Zone, Star Trek: Deep Space Nine
"The Siege": Star Trek: Deep Space Nine, The Dead Zone
"Resurrection": Smallville, Stargate SG-1, Star Trek: Deep Space Nine, The Outer Limits, Lois & Clark, Alias
"Precipice": Battlestar Galactica, Smallville
"Obsession": X-Men, Star Trek, Smallville, Superman
"Gone": Buffy the Vampire Slayer, Smallville, The 4400
"Fallout": Jericho, Stargate SG-1, Smallville
"Persona": The Spectacular Spider-Man, Smallville
"Why We Fight": Angel, Jericho
"Closure": The X-Files, MillenniuM, Tru Calling
"Provenance": Supernatural, The X-Files
For some time though, in tribute to The Twilight Zone, I had a hope that BSG would do an episode called "Number Twelve Looks Just Like You." No such luck, sadly.
There's a whole lot more, but I'm done now.