Just a quick thought on discovery tools – the major newish discovery services being vended to libraries (WorldCat local, Summon, Ebsco Discovery Service, etc.) all have their strengths, their complexity, their middle-of-the-road politician trying to be everything to everybody features. One question I have asked and not yet had a good answer to is “How does your tool save the time of the user?”. For me, that’s the most important feature of any discovery tool.
Show me data or study results that prove your tool saves the time of the user as compared to other vended tools (and Google and Google Scholar), and you have a clear advantage, at least in what I am considering when choosing to implement a discovery tool.