A few points:<p>- Don't worry about scaling, like mixmax said.<p>- The main focus should be to get the killer-webapp up and running, not getting a CV or trying out new technology. However, you don't have to step far outside the PHP communities to see people shitting on PHP <i>everywhere</i>.<p>If PHP is the only thing you know, do yourself a favour and widen your horizons. Not necessarily for this particular project, but because when the time comes, and you are getting fed up with PHP's shortcomings, at least you know there is a way out.<p>Me, myself? I'm a heavily invested C#/.Net developer, but prior to that I have worked with Atmel AVR Assembly, Motorola 68k assembly, Basic, Pascal, Python, Arexx, C, VHDL, Verilog, LabView, Matlab, Java and god knows what. Oh, and yes, PHP.<p>I may stick to C#, but I know there is another world out there. So should you.