GREAT APPS/WEBSITES!!!!
Some tried; some recommended

Coupon Sherpa
Download this "FREE" app, which allows you to redeem local in-store coupons instantly without having to clip or print them.  Click on a merchant and link its loyalty card to your account.  Select the available discounts you want and they will be applied to your purchase when your loyalty card is scanned.   Predicted Annual Savings:  $71.00
Recommended by Real Simple Magazine - April 2012 Issue. 

GasBuddy
Find cheap gas nearby.  Compare local prices at the "FREE" GasBuddy app (or gasbuddy.com).  Also, before you fill up the tank, check to see if it's cheaper to pay with cash rather than credit. 
Recommended by All You Magazine - April 2012 Issue.

ErrandTracker.com
Map the Most Efficient Route to Save Gas!  On your computer or iPhone, create a list of the places you need to go, and the "FREE" website/app ErrandTracker.com shows you the most efficient route.  That way you can eliminate doubling back and wasting gasoline.
Recommended by All You Magazine - April 2012 Issue.

Google Catalogs (MY PERSONAL FAVORITE APP)
Prevent paper pileup in your mailbox by downloading the "FREE" Google Catalogs app and you'll get instant access to over 400 digital catalogs from more than 125 brands. 
My Personal Opinion:  This is one of my favorite and most used apps (and I have a lot of apps).  I find catalogs for stores that I love and had no idea that there were even catalogs available.  For example, there are catalogs for West Elm, The Container Store, and World Market to name just a few.  You can also mark your favorites, with a Google Account, so you can always go back to your faves.  Love it!!!!
Recommended by Good Housekeeping - April 2012 Issue.