The NBC series '30 Rock' has a message in the credits to the effect of "Commercial consideration provided by Apple", and indeed the show is full of Macbooks, iPhones and iMacs.
NBC used to produce a show called Community. After they cancelled it and Yahoo! picked up it up, all the Macbooks in the show have circular stickers over the Apple logos on the lids.
Of course both shows are a bit 'meta', meaning that refer to their own product placement in a 'knowing' way - much like the product placement skit in Wayne's World 2. The premise of 30 Rock is that Alec Baldwin's character is head of "NBC and General Electrics Microwave Programming" to the detriment of the broadcaster. One episode of Community revolved around a charismatic man who is paid to talk about the positive aspects of his Honda SUV to people in his peer group - and of course Honda paid Yahoo for this.