This is a nerve-wracking time in the TV biz. This week, network execs will determine the fate of nearly two dozen series hovering between renewal and cancellation. The results will be made public beginning May 12, when ABC, CBS, Fox, NBC, the WB and UPN announce their fall schedules. Among the shows on the bubble: The Practice, Ed, Boomtown, Fastlane and My Big Fat Greek Life. Meanwhile, fans of the WB's Angel — another "bubble" show — aren't letting the cult series go down without a bloody good fight. The acclaimed Buffy spinoff topped the list of shows viewers most wanted to see return in the fall, according to USA Today's sixth annual "Save Our Shows" survey. To read David Boreanaz's thoughts on Angel's future, click here.