It's been the talk of the blogosphere, so I'm sharing it here as well. If you have a US Airways account, this could be a very valuable way to top off your account for a trip you have coming up. Just transfer up to 50,000 miles and get 100% additional. The fee breaks down to $567.50, so it's a minimal per-mile assessment.
You can find the link here.
Don't forget your US Airways account has to be open for at least 12 days in order to take advantage of this offer!