During my class (BIM Managers Guide to Automating Revit Using Macros) at RTC in Schaumburg (Chicago) last week, I mentioned the Revit Lookup addin. Afterwards several people asked where they could download a compiled version. I compiled the most recent source from https://github.com/jeremytammik/RevitLookup/ and uploaded it to my blog so you can download it (below).
Revit Lookup 2015
Extract the 2 files to C:\ProgramData\Autodesk\Revit\Addins\2015\
If you are interested in 2013 and 2014 versions you can find them in a blog post from last year: http://revitcoaster.blogspot.com/2013/09/creating-macros-larug-sept-2013.html