A few things I do to save:

Rice and pasta are both inexpensive and quite versatile.  I like to buy them in bulk and use them in a wide variety of recipes. 

If you're a woman you may find ditching your disposable sanitary pads in favor of reusable ones you wash can save money (and they're better for the environment).   I love the ones I got from Swaddlebees (they mainly make diapers but they have a few products "just for moms", which include the pads).

That old adage, If it's yellow, let it mellow..  can save a great deal of water and reduce the water bill.  Likewise a low-flow shower head can work wonders, along with shorter showers.  I have even been known to turn off the water sometimes while soaping up or shaving, then turn it back on again to rinse.  It's amazing how much water just goes down the drain while we're doing those tasks. 

CFLs (Compact Flourescent Bulbs).  They really do save on your electric bill, and you have the added bonus of not changing your bulbs as often. 

Rechargeable bateries.  The batteries themselves are not much more expensive than traditional batteries and you can recharge them many times before they need to be replaced.  I got a charger that will charge all household batteries from AAA-D and 9-Volts for under .   I can't estimate how much I've saved just by doing this.