CrazyBob and Chiara are debating XP… I haven’t done true XP, however I can comment on some of the principles…
Many developers have massive egos. The simple practice of requiring every checkin to have a code review seems like a basic rule. Peer review should be a requirement. I have actually heard a developer say “No one can code review my changes, they are too complex.”
I agree with CrazyBob about having someone review your changes keeps you honest. When I review changes I try to set a really high bar – and I want people to do the same for me. When you get caught up in writing tons of code, it is so easy to cut corners. I believe that we all need someone looking over our sholders to keep us honest. Maybe I’m the freak 
I’m not sure that “pair programming” is the solution to this – but injecting some process into development is a good thing. It is all about balancing process and productivity.
http://www.simplegeek.com/permalink.aspx/102
