Giving blood is one of those things that everyone (who can) should do. So kudos to the Balboa Cafe, which is teaming up with the Blood Centers of the Pacific for a"Burgers for a Pint" promotion. Though you won't get one of their famed Bloody Marys, anyone who donates plasma during the restaurant's annual blood drive will be eligible for a free Balboa burger. Seems like a good deal to us (September 30, 3–7 PM; San Francisco branch only; to schedule an appointment, log in at www.bloodheroes.com and scroll to September 30th).