These sites usually have copies of their latest articles from their magazine or for-fee services. They’re often controversial, but are full of insightful opinion and advice.
Software Development Magazine: Software Development Magazine has a Web site for their influential articles on UML. Always interesting. Take a look at their UML Design Center at www.sdmagazine.com/uml/.
DevX: DevX has an excellent set of recent articles on UML in their UML Zone. Some of their best stuff requires a paid-up membership. Take at look at what they have at www.devx.com/uml.