The company I and a few others here on the forum work at (*cough giant black and red telco cough*) lay off people so often, on Friday I said to my boss "Hey, there hasn't been a layoff since January. Must be because of ..."
I've survived probably 30 layoffs in the past 10 years. Now there's only 2 of us left and my boss. At least it's handled well. Everyone knows it's 2 weeks pay for every year working + saved vacation time, pro-rated yearly bonus, etc. When you get notified, you also still work for a month to "find a new internal job" if you want, or just don't show up, it's up to you.

Now, I've been laid off from other jobs. One was classic: I was in the car, driving to my recruiter's office for a meeting on a new job, when the guy my company hired to do layoffs called. At the end of the discussion, he asked why I was so calm, I replied that I still had time to get to the interview I was driving to.