This post will be an ongoing one that I will add to as I get new information. If you know of any good birthday promos or freebies, please add them to the comments so we can keep this list going. If you have a blog, please be sure & include your address so I can give proper credit.
Baskin Robbins Birthday Club: Free scoop of ice cream plus a discount on an ice cream cake for your birthday
Claim Jumper: Free dessert for your birthday PLUS a free "small bite dessert" just for joining the eClub. Add your children to your eClub membership & they get a free "build your own sundae" just for signing up plus a Free Little Jumpers Meal on their birthday.
Cold Stone Birthday Club: Enjoy a free creation on your birthday
Dairy Queen: Join the Blizzard Fan Club & get a Buy One Get One Free coupon for a Blizzard via email for your birthday. Enjoy other coupons throughout the year!
Macaroni Grill: Free chocolate cake (a piece big enough to share) on your birthday (just tell them it's your birthday and it will be brought out, plus one of their talented wait-staff will sign you an operatic Happy Birthday if you'd like)
Noodles & Co.: Sign up for Noodlegram, their newsletter, and get a coupon for a free dish on your birthday & a surprise on your Noodlegram anniversary. Get a Buy One Get One Free coupon just for signing up!
Qdoba eClub: Get a free gift on your birthday plus free chips & salsa just for signing up! (Thanks Jen for responding with this)
Red Robin eClub: Free burger on your birthday (for vegetarians you can substitute a Gardenburger or Boca Burger on any of their hamburgers)
Regal Cinemas & your Entertainment Book: There is a coupon in the Entertainment Book that you can take to Regal Cinemas on your birthday for a free movie! Be sure to also sign up for the Regal Rewards club. You get lots of cool freebies with that like free popcorn, candy & even movies!
Starbucks: Register your gift card and get a free drink on your birthday! Coupon is mailed to you.
Todai's (Portland, OR): Get a free dinner (up to $25 value) on your birthday when accompanied by at least 1 paying adult! Also, sign up for their eClub and get a $5 coupon emailed to you within 2-3 days. These are franchises so if you are not in Portland, be sure to call your local restaurant to find out what they offer. (Thanks Troy!)