Mac: The retina display on the new MacBook Pro is great to look at, but not every app has been updated to support the higher resolution. Retinizer allows you to force higher resolutions in apps where it's possible.
Right now, Retinizer works with a handful of apps, including Microsoft Office. It doesn't work with Adobe Creative Suite or any Adobe Air apps yet, but the process to attempt upgrading other apps is simple. Just drag the app into the Retinizer window, click "Retinize!" and you're done. Check out the developer's site for the list of compatible apps and a free copy of Retinizer.