Every math teacher has heard the following, "How will we apply this in the 'real world'?". Here are some sites that will help you create "real world" lessons.
The Hands-On Technology Program has a section devoted to checkbook math. Just print out the pages, get busy with the scissors for a few minutes, and you have checks, checkbooks, deposit slips and bills – everything you need to teach how to manage a checkbook.
Ask Eric (from the U.S. Department of Education) has a number of practical math lesson plans aimed at every class level from K thru 12! Add additional search terms to zero in on your needs.
S.O.S. Mathematics via the University of Texas, El Paso, includes about 2500 pages of mini-tutorials in algebra, trig, calculus and practice tests.