Among a crowded field of Internet phone providers, Skype has turned heads with its unique blend of technology, grassroots marketing and rapid adoption. Sixty-five million people have downloaded the free software in the 18 months since Skype launched its product. In recent weeks, <A HREF="http://news.zdnet.com/2100-1035_22-5576254.html?tag=zdnn.alert">there's been a spike in complaints</A> about the company's first commercial service--SkypeOut--that lets customers cheaply make calls off the Internet to ordinary phone lines. Aside from having to wait days for accounts to be credited--as dozens of customers have complained--many SkypeOut users say their conversations are disrupted by a two-second delay between someone speaking and being able to hear what was said.