How do I cash out a CoinURL voucher?

[salfter]

DailyBitcoins gave me yesterday, in addition to the usual BTC0.0005 (?) payout, a BTC0.005 CoinURL voucher.  Some poking around on CoinURL's website didn't turn up a method to redeem it to an address.  What are my options?  What can I do with this voucher?

[giantdragon]

CoinURL vouchers are similar to the Google AdSense coupons, so you can only spent them on advertising or sell to someone who need it.

[chriswen]

I "cashed in" two 0.01 vouchers so far.  I just got a 0.005 voucher but it's one in the morning and changed pages by accident.