Cortex Prime and Champions Now, both as PDFs from DriveThruRPG.
The former was because someone here posted a link. To be honest I was a little disappointed - for someone who already has MHRP and the Hacker's Guide, it doesn't add a great deal.
The latter was because I saw someone on some website or blog talking about it. I've known for a long time that Ron Edwards was a huge Champions fan, and so I was curious as to what his version would look like. I've been playing some Edwards RPGs recently - Fantasy for Real and S/Lay W/Me - and so have become interested in how he presents RPGs. Particularly how he sets out the relationship between prep and play.