I'd like to know if WordPress is capable or if it is the best solution for building a coupons site? Take RetailMeNot.com for example, does it look like they are running WordPress? In some ways it sort of resembles a blog. What kind of plugins can achieve those similar functions?

Some features:
If you click on a coupon, it opens a popup window and a new browser window with the merchant's website. You can save coupons into your account (if you create one). More importantly, how are they able to update thousands of coupons on a daily basis? Is there some way to auto-feed them or are employees manually entering the coupon codes, typing the short descriptions, and inserting an image?

Any input or help is much appreciated. Thank you.