Fun at a Discount: Family Deal Sites

We're always looking for good deals on things to do with the little ones. Lately I've gotten into using various discount sites, and we've found some great deals on food and activities (at least 50% off). For instance, we got half-price tickets to the children's museum (saving those for a cold winter day!). So far, I've come across two sites specifically geared toward families:

Mamapedia Sweet Deal - includes deals for the following cities: Atlanta, Austin, Chicago, Dallas, Denver, Houston, L.A., Miami, New York, Phoenix, Portland, San Antonio, San Diego, San Francisco, San Jose, Seattle and St. Louis. When you make a purchase, 5% of it goes to the school or preschool of your choice.

Famgrab (click at the top to change the city) - includes deals for the following cities (all in the South): Atlanta, Austin, Charlotte, Dallas, Houston, Indianapolis, Jacksonville, Louisville, Miami, Nashville, Orlando, Raleigh-Durham, San Antonio, St. Louis and Tampa. With Famgrab, 10% of the site's profits go to a different charity each month.

Each site has a different deal each day; if a certain number of deals are not sold (but you buy one), your credit card is not charged but the deal is also defunct. This seems to rarely happen. Usually there's plenty of interest in a deal--especially if it's a good one!

Tips:

• Be sure to check on the expiration dates. Sometimes you know you won't make it to a certain location before your discount expires. 
• Sign up to receive the daily deals in your e-mail. That way, you don't have to remember to check the site.
• If you find a deal you like, buy it! Remember, it won't last past the day and it may not last that long if it sells out first (many of the deals on these sites don't have a maximum number of deals, but it never hurts to be sure you have yours).
• Always carefully read all of the details to a deal. Some may have restrictions you can't work with. (However, generally, they're easy to use.)
• Keep other cities' sites in mind for when you'll be traveling. Then you can buy before you go as they come up and enjoy the discount when you're on vacation!

Know of any other family-deal sites?