Right now GOOG is paying >0.5% if you sell an IB EFP; and this is with no dividend play. It's not much, but it's more than what has been available for awhile and more than what any other brokers that I can find are paying.
Hasn't this been discussed to death already? Yeah, you might be earning 0.5%, but you have to put up at least 20% of underlying to purchase the future. Since presumably you're making (or at least have aspirations of making) more than 0.5% a year, this really seems like a Fail.
OK if you are near fully invested all the time; EFPs for obtaining interest on idle cash are not for you. But there may be traders on this forum. So, for example, for futures traders with ongoing large cash balances EFPs have been a genuinely worthwhile tool for years--even more so during periods when interest rates are higher than they are now. And those who only day trade futures can allocate nearly their entire account to this without incurring any debt charges. Furthermore, this is the first time in quite some time that > 0.5% has been available in an EFP without a dividend play. The object of the post was to make other players like myself who are interested in that and who might want to take advantage while it's still available, aware. That is, if you don't mind. But thank you for adding character to an otherwise innocuous thread.
For interest on cash, you'd want to sell short your EFP. Your two best sources of information are the IB site and this board. Just do a search; just about everything has been has been asked and answered, as joeactuary so crudely pointed out.