For LINQPad Premium users, I've just released a beta with NuGet integration:
The idea is to use LINQPad as a scratchpad for NuGet packages. Click on a package and use LINQPad to experiment with it, exploring its functionality in an immediate, fun and .Dump()-friendly environment.
Go to query properties (F4) and click "Add NuGet". NuGet references are treated as first-class, so you can save them to snippets, use them in "My Extensions" and in defaults for new queries. When you update a NuGet reference, the effect is global, so saved queries will reference the latest version. And if you send a .linq file with a NuGet reference to someone else, it will ask them whether they'd like to download the NuGet library automatically upon opening the query.
Let me know how you get on!