OK, for the Budget Minded:
ShopSavvy - Free app, scan a barcode and get the local prices of a product.
Amazon - Free app, also can scan a barcode and see amazon's price.
Productivity Apps:
Genius Scan: Free app, I originally used this to keep color copies of Business Cards, but it's much more. I also have imporant items like Auto Ins Card, Registation, newspaper clippins. AND, you can use as a scanner and e-mail/fax documents right from your phone. Really slick!
AutoCAD 360 - Free App, GREAT for field work, access AutoCAD Drawings. Can't believe this is FREE!
Disney:
WDW Lines - Free App, Additonal Charge for Membership.
DME - Disney's Magical Experience - Free App, must have for Magic Band and FP+
FINAL ONE:
Apps Gone Free - This app will tell you each day, around noon, of Apps that are Free to download that day only. Usually a list of 8-12 apps each day. You can look them over, and try them out. If you don't like them, at least you haven't paid anything for them.