I got laid off in March. Everything about the severance posted above is correct, with some additions:
1) It is one week of severance per year of service, but if you have less than 4 years (like I did) they round up to 4 weeks. I only worked there for 2-1/2 years but I got 4 weeks of pay.
2) The extra 2 weeks you get is if you waive your right to sue for wrongful termination, age discrimination, stuff like that. I had nothing to sue them over so I signed. Hey, free money!
3) You have to pay your own medical, but for the first 6 months you're paying the same rate you did when you worked there, though when you were working you had it taken out of your paycheck. Now, you have to pay them yourself. You can have it automatically drafted from your bank account, or you can log in monthly and put it on your credit card to get miles. But if you miss the payment due date, you lose your discounted medical rate.
4) You also get 3 months of job placement service, starting from when you contact the company (NOT from the date of your layoff). They will help with resumes, cover letters, interview skills, job boards, etc.
I was in the Leadership (level 2) band, I don't know if there's anything different for the Professional (level 1) or Senior (level 3) bands.