Let me ask, maybe you know: say I want to build a finance app that basically crunches a lot of data accessed from a DB, does some pretty intricate subsetting of the data, and produces Excel reports (XML). I currently do this with about 1300 lines of R code and a SQLite DB. Pretty lean and easy to use (was a bitch to write, tho, really stretched my understanding of lexical scoping and functional programming). If I wanted to webify this, the main challenge that I think I face is finding a framework that allows me to do all that nitty gritty data subsetting and summarizing - this is where R is really excellent, more flexible and expressive than SQL. What framework, if any, might you recommend? What kind of stack would be good for a beginner?