Season 15 of MTV’s "The Real World" debuts Sept 7, 10pm, from Philly. A 1-hr casting special premieres Tues, 10pm. — "Days of Our Lives" fans going through withdrawal (the soap doesn’t return to NBC until Aug 30) can get a quick fix at SOAPNet as it hosts a 2-wk "Days Decathlon," which began yesterday. Featuring favorite eps of the show’s stars, the stunt concludes with a 1-hr special (Aug 27, 7pm) recapping the storyline and a sneak look at what’s ahead (important since half the cast’s been marooned in New-Jungle Salem during the Games-not that CableFAX watches, or anything… Do you think Sammy’s really going to marry Lucas?). — Startup college channel The U Network got a GOP press pass and will produce a weekly "W Show" going behind the scenes of the Bush- Cheney campaign beginning next month. — Q Television’s fall lineup, designed for a gay/lesbian audience, includes a history series, a Sapphic talk show and "Giggles," an alternative standup comedy show. Q launches in Sept. — GoodLife begins carriage on Cox San Diego’s lifestyles digital tier today.