I fear this is the kind of news that will push way more talented people off the ledge: Ryan Seacrest Productions has signed a new multiyear deal with Comcast Entertainment Group that expands his TV and New Media production biz across the cable giant’s networks. The agreement gives the cable giant first-look rights to all his company’s projects through August 2011. It also expands Seacrest’s aslready in place deal to provide programming to Comcast’s family of networks. So now, instead of just E! and The Style Network, Seacrest can program for G4, Versus, Golf Channel, exercise TV, FEARnet, Comcast Sportsnet and PBS Kids Sprout. (What, not Shark Week on The Discovery Channel?) The new pact also includes a new advertising relationship between E! and Seacrest’s radio properties, which include the syndicated American Top 40 and the Los Angeles-based On-Air With Ryan Seacrest. The deal follows yesterday’s news that Seacrest’s longtime William Morris agent of 8 1/2 years Adam Sher is leaving to head up Ryan’s production company. How sad is it that Comcast’s Ted Harbert, who used to run ABC Entertainment, calls it “a personal and professional thrill” to be in even bigger business with the Viscount Of Vapidity. Yes, showbiz is very very unfair.