NuGet Package Management
Please consider NuGet integration.
I would also suggest changing LINQPad scripts to not just be XML files but indeed something like a tar'd/zip'd archive of XML and DLL files with NuGet integration and update mechanism.
This would be super compelling and useful and much more light-weight than using NuGet from VS.
Matteo Migliore commented
Please move your votes to "nuget integration" :)