Delivering the day's top news, highlights and the best of NetworkWorld.com.

Sun introduced its Nehalem-based server line-up today, along with a new networking product that takes aim at an emerging rival in the server market, Cisco. Also, BlackBerry users around the United States were stranded for about three hours yesterday when their Web-based e-mail service blacked out. (6:17)
* Sun fires back at Cisco with blade network switch
* BlackBerry Web e-mail users experience three-hour outage
* Amazon says listing problem was an error, not a hack
* Oracle not budging on maintenance fees
* Analyst: Dell in smartphone talks with China Mobile
* Investors buy back StumbleUpon from eBay
Network World's Twisted Pair Keith and co-host Matt Hamblen talk about whether we'll ever trust the cloud, how people will use the iPad, and why older people might not want to retire any time soon....
Network World's Newsmaker of the Week Dave Hansen, corporate senior vice president and general manager of the Security and Compliance business unit at CA will host a panel at RSA discussing cloud security and...
Network World Panorama Enterprises are quickly going mobile - are you ready for the explosion of devices, platforms, applications and users? Keith Shaw talks with BoxTone CEO Alan Snyder...
The Open Network Joe 'Zonker' Brockmeier, speaks with Chris Blizzard, director of Developer Relations at Mozilla. Chris gives a sneak peek at what's to come in the next releases...