I was laid off back on May 9th. Like you I was given a heads up. I too survived 4 layoffs over the last 2 years. I started networking as soon as I knew I was gone. I started getting in touch with people I know, they are your best source. I had my resume on dice.com and monster.com. My real break was from a guy I'd worked with 8 years ago. We had lunch about a month prior to me being laid off. On the very day I was laid off I had a message on my machine at home. You guessed it, I started my new job a week later for more money. I feel really lucky but I also did a lot of prep work. Call the people you know and never, ever burn any bridges.
Good luck.