I like the proposal to put a fixed dollar-pegged ceiling price on the large remaining percentage of 50% XRPs that will NOT be given away.
According to the wiki here
https://ripple.com/wiki/XRP the founders intend to retain 20% and according to posts elsewhere, OpenCoin Inc (which is effectively controlled by the founders) will end up retaining another 30% after the giveaway.
At that point OpenCoins' founders (and through their control, the company) will have to decide if they want to become Craigslist or Google level wealthy, i.e. how much eventual long term wealth is enough ?
If they want to become like Google, they will keep those 50% of XRPs sequestered for long periods of time and will eventually pass most of them down to their heirs, etc.
If they want to become like Craigslist they will adopt the proposal made earlier in this thread to do an orderly sell off of all but say 1 to 5 % of the remaining XRPs at a fixed USD-denominated low price to ensure that the cloud of a "giant XRP hoard" is no longer hanging over the network, but this will still leave both the founders and the company wealthy, just Craigslist wealthy not Google-level wealthy.
There ARE ways to ensure that it's hard to fake the distribution or fake sales of XRPs by limiting sales to aged accounts and in fixed maximum per day quantities, etc.
Cheers ....