Initially these will primarily be PCs, but down the road Microsoft envisions .Net facilitating the Internet-enabling of a wide variety of devices, from PDAs to televisions. Without a doubt, .Net is a significant evolutionary step forward for Microsoft development tools. I am one of many beta testers who have been impressed by Visual Studio. There's more to the story, however. Not everyone is thrilled.
Some developers just stifle a yawn when .Net is mentioned.
It's also shipping now, whereas a significant part of .Net is still a long way off. Sun ONE has a couple of potentially important advantages. First, it is completely based on open standards, namely XML and Java. In contrast, .Net is tied to the proprietary Windows platform.