The NetBeans equivalent for the Eclipse Problem View is the Action Items Window, accessible via Window | Action Items in the main menu.
It is a central collection point for problems found throughout all open projects, or the current project, or the current file, with problems and filters that can be set. And it can be configured further in the Options window:
There's always more info that the Action Items Window could provide. In other words, if you're missing something from this feature, please let us know, either via an issue in Issuezilla or via some comments at the end of this blog entry. Since the Action Items Window is extensible, would be cool to hear of some use cases that are currently not supported, to inspire the creation of some new plugins!