Did you or that guy already have another job lined up, or did you just walk?

Also, when you decided to leave, did you give your former employer 4 months notice or was it less (the standard 2 weeks) and it grew to 4 months? If you already had accepted the other job, how did you handle pushing back your start date with them?

I'm curious, because I'm currently entertaining changing jobs. More money isn't the main reason, it's because I want to work on more modern technologies, and my current job is stuck in the mid-1990's.

I'd also be interested in any details you'd be willing to share about these fallouts.