Thanks for all the great suggestions, everyone!
I'll add a few more of my own.
1. Negotiate a new rate with your phone, cable, credit card, internet & ?? companies.  Call and ask if the rate you're getting is the best rate they can do.  I was able to upgrade my cable service and decrease my cable/internet bill by $20 a month... just because I asked.
2. Make your own laundry detergent.  It really *is* cheaper AND it's environmentally friendly.  And I know that if I'm about to run out, I can make more b/c all the ingredients are in the house: Borax, Fels Naptha soap, and Washing Soda.  Google the recipe to find one that fits your needs.  Added bonus: people will think you're nuts.
3. Add up those little daily expenditures to see how they're really hitting your accounts.  That daily coffee, bag of cookies at the grocery store, unecessary drive across town all add up to affect your bottom line.  I've replaced a mocha with tea, homemade cookies for the store-bought ones, and use my work-supplied bus pass not just for my commute, but on weekends in town, too.
4. If you must have soda, get generic.  I can get a 12 pack of my store brand soda for $2 whereas a single bottle in the work cafeteria is $1.50.  It's a rare treat rather than a daily occurance to have soda.
5. I subscribe to 
www.everydaycheapskate.com to get tips for living more cheaply.  Note - not all of her tips are environmentally- or waistline-friendly.
6. I keep powdered milk in my desk at work.  Today I was in a rush to get out of my house but hadn't had breakfast.  I grabbed some cereal and made some milk at my desk.  Voila - cheap breakfast!  Powdered milk doesn't go bad and is great in tea.
7. Women - get your hair cut at a cheap-o place for $15 but go to the fancy salon and get the $5 bang trim.  My pricey place does bang trims for free!
To stay sane and not feel deprived, I've kept some vices.  I drink an entire pot of tea all to myself.  I still enjoy wine.  DBF and I even go out to dinner (at a cheap Asian restaurant) every so often.  I knit things for myself, not just for others.  I count my blessings.  I spend time with friends, even if it's just to go thrift shopping or get together for biscotti that I made.  My goal for 2009 is to incur no new debt and make a significant chunk in the debt I do have.
Keep the tips coming!