(Kicking around an idea to build this:)

Would anybody be interested in a local DNS server that automatically updated its list of black-holed domains through a mechanism that preserved your privacy? (Assuming, of course, a decentralized representation of the block lists.)

Would anybody be willing to sell their attention by accepting payment (BTC), perhaps through a dutch auction, to re-enable a black-holed domain for a time-limited period? (Hand-waving the mechanism for ensuring that the domain was actually whitelisted.)

I'd personally be interested in the former, and would likely use the latter - even though I find it hilariously unlikely that Ad Networks or Web Sites would participate in bidding for my attention directly.