Testing. Test it. Test.

I am a large fan of two things - Testing and Test Driven Development.  I think it is time to slow it down out in the IT world and write GOOD code over OK code that gets the job done.  It might take a bit longer, but in the long run, time and money will be saved!!  There are numerous ways this can be accomplished IMHO both from a process standpoint (good SDLC methodology rigor) and also from an actual Development swinging the hammer cutting the wood standpoint.  Testing is equally as important to good development for long term maintenance.  A couple of articles along those lines:

http://net.tutsplus.com/tutorials/php/deciphering-testing-jargon/

http://blog.pluralsight.com/2012/10/15/tdd-is-there-really-any-debate-any-longer/