In my career, I've gone from Waterfall, to XP, to Agile/Scrum methodologies.I've also spent some time doing V-Model. Personally, I'm looking forward to the switch to the "Screw It, This Works"™ methodology. Looking forward to the Addison-Wesley book series!
Edit: I've just founded the "Screw It, This Works"™ Alliance. Sign up today to become a certified SITW Master.