We were there recently...Hubs was laid off in November, and we had a month worth of severence pay. Here are a few things we did:
*If you have student loans, get them put in deferment/forebarence.
*Apply for food stamps/WIC.
*Take some of your remaining pay and create an emergency stockpile: toilet paper, paper towels, shampoo, deoderant, advil, razors, dishwasher/laundry detergent, etc. Things we knew food stamps wouldn't cover but that we figured we'd need and may not have money for in the coming weeks.
*Call you landlord/mortgage company and let them know about your situation right away. If you keep them in the loop now, they're going to be more willing to work with you later.
*If you have monthly perscriptions, see if you can refill them all now. Sometimes you can get a discount if you do 90 day supplies.
*Call about energy assistance. It's a little early, but our local offices start taking appointments in September. Make one, even if you're optimistic that you won't need it by fall/winter.
*This seems silly, but we also paid off our library fines. We knew tight times were coming, and access to the library allowed for CDs, DVDs, books, etc. for free.
Anyway...I have a blog where I've been documenting our experience. I can PM you the link if you want it. It might give you some other ideas! Good luck!