> a SQLlight database seems like the best way to go

given your initial scenario of read-only Excel files, i disagree. why plumb 
data from Excel into SQLite and from SQLite into a web UI via several layers of 
Ruby code, themselves distanced from underlying datastores via ORM libraries, 
when you can specialized .XLS oriented tools oriented to non-coder (or 
quasi-coder)

i dont have anything to do with Cambridge Semantics, but if i had a copy of 
Excel or Windows i'd check it..

http://www.cambridgesemantics.com/products/anzo_for_excel

if massaging the data or filtering it one could try Refine:

https://code.google.com/p/google-refine/

if it was me, i usually use xls2txt and an on-the-fly RDF (to JSON/Hash in RAM) 
conversion and skip the SQL or "non-programmer" tools which mean well but never 
do quite what you want (or require excessive gymnastics vs a few lines of 
Ruby/Haskell)

http://gitorious.org/element/element/blobs/master/ruby/W/csv.rb

also Camping may be *just* what you are looking for..
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