I haven't tried it yet, but it looks like NuGet Package Explorer should be able to do it:
http://nuget.codeplex.com/wikipage?title=New%20features%20in%20NuGet%20Package%20Explorer%201.0
Downloadable from:https://github.com/NuGetPackageExplorer/NuGetPackageExplorer
http://nuget.codeplex.com/releases/view/59864
(or like Colonel Panic says, 7-zip should probably do it)