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A few questions, because I also thought of this (and would love to see this happen):

Can sellers of hashing power also specify a rate per share relative to current difficulty? (Something like "Every share down to 105% PPS at current diff")?
Can smaller miners also use this service? Meaning, if I only own 1 GPU and have a few dozen MH/s, am I still able to use this?
Will there be (public) stats?
Can contract buyers supply their own getwork source or can the only choose from predefined pools?
I guess for some reson it might be important: TOR access?
In general it seems to me like the "pay per click" auctions for web ads on Facebook/Google, just with solutions to mining shares. What language do you develop this in, and will you release the code? I'd be very interested in helping out there, if it is in a language I regularly code in...