Hmm, a few people including Kevin Maney at USA Today seem to have got confused about who made the original Pledge. It was created by a user of PledgeBank, not the team that runs PledgeBank. PledgeBank hosts any pledges which are not themselves illegal, or which incite illegal behaviour.
The little experimental cascading pledge we made yesterday was just that - it was mainly about testing a new feature which we're not quite sure how to present to our users yet. I know OLPCs aren't on general sale, and may well never be, but I'm sure nobody would object to the formation of some hacking clubs if they ever were to be made available for purchase.