* NBC to develop shows with sponsor involvement. <br />* KEVIN MARTIN rejects SKYPE's open network proposal. <br />* SAG begins negotiations April 15. <br />* BLINKX launches BBTV video service. <br />* FOX and NBC to use JUMPTAP for mobile ads. <br />* PLUS: CBS layoffs, iPhone rumors and more. <br /><br />Read more at <a class="link" rel="nofollow" href="http://www.ShellyPalmer.com">http://www.ShellyPalmer.com</a>