The BBC is offering limited online access to the OED as part of a BBC miniseries on the famous (and famously huge) dictionary. Unfortunately, it’s only available until February 13, and according to Boing Boing they are trying to limit access to Brits only. However, you may want to try to get in, because I managed to access it from here in Chicago. (I emailed Cory at Boing Boing to suggest that perhaps the restrictions had been lifted, but he chalked it up to the fact that “IP-based filters genuinely suck.”) At any rate, considering the astronomical cost of the OED, it’s worth a try to check it out while it’s free.
Update: More details at Language Hat.