Yale MeSH Analyzer - a tool to compare up to 20 PMIDs at once

I stumbled across the Cushing Library's Yale MeSH analyzer yesterday. It's a great tool for comparing commons fields in up to 20 PMID articles at once: http://mesh.med.yale.edu/. Watch a video of it in action here.

Have you ever been asked to create a search strategy to fit in pre-specified articles? Or just trying to identify more MeSH terms or keywords based on a few articles you already have? This tool is a breeze to use and has lots of potential applications.