Within LibGuides and LibAnswers, search across these apps and your LibCal events too. Include search results from any 3rd party source - such as your library catalog, individual databases, etc. - any resource that offers an open search API!
Display your LibAnswers and LibGuides search results in either Bento style or Tab style and customize it for each App. Control the relative search weight within each of these resources so your custom unified search is just that...custom.