MicroWebFrameworks are a response to WebFrameworks that try to do everything while sometimes being hard to fathom, or are too full-featured for simpler needs. To get this page started, here's a summary of Ruby web microframeworks:
http://stackoverflow.com/questions/812856/what-are-the-main-differences-between-sinatra-and-ramaze/1086264#1086264
--DaveEveritt