I don’t see a Visual Studio plugin for it (although I didn’t look that hard, so I might have missed it), and searches turn up random third-party solutions, but is there something that comes with PowerShell or something that plugs into Visual Studio?
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Visual Studio templates are available here. And there are samples in the Server 2008 SDK for developing providers and hosts.
If you are talking about an IDE for scripting, see this question (How to Get Started with PowerShell)