As someone who’s recently experienced the event, here’s a couple great sites with free stuff you can get on your birthday:

Portland specific stuff: http://portlandonthecheap.com/birthday_perks.html
More universal: http://www.heyitsfree.net/2006/10/03/birthday-freebies/

Even though DisneyLand isn’t doing their ‘free ticket on your birthday’ thing anymore, there are plenty of other great deals.  Some of the better ones:

• Black Angus Steakhouse Free steak dinner.  Join the BA Prime Club and they’ll send you a free dessert just for joining and then you’ll receive a coupon good for a free steak dinner.  The free steak dinner birthday offer is good from two weeks before recipient’s birthday to two weeks after recipient’s birthday.  Birthday offer requires the purchase of 2nd entrée of equal or greater value.
• Medieval Times – Sign up in advance and they’ll send you a free ticket (worth $53!) to one of their feast and tournaments.
• Benihana Sign up for the “Chef’s Table” and you’ll also get a complimentary Benihana Birthday Dinner certificate, maximum value of $30 (excludes alcoholic beverages, gratuity and tax) that will be emailed to you for use during the month of your birthday.
• Claim Jumper Join the Claim Jumper E-club and they’ll send you a coupon via email for a complimentary entree for your birthday.  Offer valid up to a $18 value.  Dine-in only, not valid on liquor, gift card purchases, tax or gratuity.  Expires 14 days from date sent
• Red Robin Sign up for the E-club and get a free burger during your birthday month.
• Ruby Tuesday Join the ‘So Connected’ club and they’ll send you coupon good for a free handcrafted birthday burger!  Must  present valid ID and printed copy of the coupon.  Expires 14 days from date sent.
• Noodles & Company Free entree.  Join the Noodlegram E-Club and they’ll send you a free dish voucher good for your birthday.  This is not a buy-one, get-one free, this is truly a birthday freebie that is good for one week before and one week after your birthday.
• Moe’s Southwest Grill Free entree.  Sign up for the e-club and they’ll send you a coupon on your birthday for a free menu item.  The only Oregon location is in Wilsonville.
• IHOP -Free Rooty Tooty Fresh and Fruity or menu item of equal or lesser value.  Must join the “Pancake Revolution” online and you’ll receive a free menu offer on just for signing up, as well as on your birthday AND on the anniversary of your sign up.
• Home Town / Old Country Buffet – Sign up for their eClub and you’ll get a buy one adult buffet meal, get one free coupon.  Good for one week before and one week after your birthday.  Coupon is not valid on holidays or on Sundays.
• Fuddruckers Free 1/3 pound burger or other Fudds entree of equal or lesser value.  You must sign up for the Fudds Club online and a few days before your birthday you’ll receive the email coupon.  Offer expires 14 days from date sent.
• Chang’s Mongolian Grill – Free meal on your birthday (as long as you bring another dining patron).  Bring your ID

Sweet!  Let the birthday fun begin.