For permanent data storing I like MySQL and its innoDB engine to ensure data consistency, building normalised database schemas in which fit all the data you need.
Some example of the apps I've been actively working on are: www.getmyboat.com, www.corksharing.com, www.zigair.com, backend for some private apps (Florida Hospital).
Daniel M. has added 4 portfolio pieces. Create an account to review them.
oDesk Readiness Test for Independent Contractors and Staffing Managers