Here are a couple deals for the frequent flyers/hotel stayers out there.
If you're a member of Choice Privileges (Comfort Inn/Suites, Quality Inn, et. al.) two separate stays will earn you a free night. Note this is two STAYS - whether they last one night or one week. This deal is good for arrivals through 4/30/09.
For past promotions similar to this, your blog author has been known to stay in two separate properties 1/10 of a mile apart on consecutive nights to get the bonus. Worth it.
If you're a member of Southwest Airlines Rapid Rewards (and if you live in Kansas City, you're crazy if you're not), you can get quadruple credit when renting from Hertz. Any rental of two days or more gets you 2.0 credits instead of the usual 0.5 credits. Use:
Promotion Code 124806
This is a great deal--2.0 credits is typically what you'd earn for a roundtrip flight, and when you consider that you only need 16 credits over TWO YEARS to get a free ticket, a lot of people would rack up enough travel to go gratis at some point. The Hertz deal is good until 8/31/09, so use it and abuse it.