Anyone who does Ruby on Rails development should familiarize themselves with mod_rails aka Phusion Passenger as the brand new v2 RC is just amazing. Just take a look at those improvements: from buffered uploads so apps don't get stuck, to a tremendous reduction in the memory usage, Rack and WSGI support (yeah, it can run Python apps!), improved startup time... it's everything Rails needs to cross that last hurdle of acceptance with people who didn't like the deployment requirements for Mongrel et al. Awesome stuff!