UPDATE AS OF 1220 EST IT IS GOOOOO, go do a sprite cap and rejoice in the giftcard!!!!
Now to convert the gc to amazon
I'm really glad the OP put "beware" in the thread title, as I wouldn't have opened the thread (until tonight) unless that updated title scared me witless.
But, yeah... I had just under 500 points when I saw this, so I used the Coke widget to enter 3-point codes until I had 499 in the bank, then topped it off on the web site to get over 500. Luckily, that next-to-last code I had in reserve was a Sprite cap, so the bonus offer(s) came up at just the right moment. (There was another bonus offer for a contest of some sort, but I lost that link with some Firefox fumbling of my own.) The 10th code I hadn't entered yet was a Powerade cap, believe it or not, but the deal came up for the Sprite one, and my new virtual gift card seems to be labeled a Sprite reward of some sort.
At any rate, good luck to everyone else going for this! I've got enough access to Blockbuster game rentals already, so the money to use anywhere (at least online without an offline card-request fee) is a nice bonus. Thanks for the heads-up, CAGs!