I've often wondered if it might be possible to set up an 'auction' system for papers. Post on arXiv and then have journals 'bid' for publication - saying how much they would charge in publication fees, review turnaround etc. Authors can then choose the journal they prefer. The advantage would be that the initial stage of 'shopping around' would be eliminated (sending a paper to a journal and being rejected without review) and there would be incentive for journals to reduce publication fees. Just a thought...