NuPack (NuGet) on Visual Studio 2008

No…It supports only VS 2010

From NuPack FAQ

The NuPack Package Manager Console
requires that PowerShell 2.0 be
installed, thus NuPack requires one of
the following operating systems:

* Windows Vista
* Windows 7
* Windows Server 2008

NuPack also supports:

* Visual Studio 2010
* Visual Web Developer 2010 (this support is planned, but not yet
implemented.)