If you like Django/Rails I'd suggest you check out Perl's Mojolicious - very modern Perl web framework. There's also Dancer - both seem much easier to use & set up than Catalyst
Agreed - a bunch of pie charts (not great communicating info at the best of times) could hardly be called a "visualization" in the modern sense of creating a graphic that makes data easily understandable, visually appealing & useful
Thanks - no plans to start charging as I essentially want it to grow into a community-based search engine.
Largely a proof of concept for now, maybe one day in the future might charge for indexing of private bookmarks, PDFs, etc, but those features aren't currently implemented due to technical complexity.
On a related note I'm interested to see how www.lumi.do does as this is one of the future feature possibilities I was thinking of for bkmrx...