I wouldn't bother with this. It requires editing a file in each app's directory (after jailbreaking) and according to the article only works for a handful of apps.
I have, it's not to bad. I only have a handfull of apps for the iPhone and when it works, it's great. I use it for Facebook, Thechive and Apples remote app, so far so good. I did hear about an app called Fullforce in cydia that does the same thing, only in your settings. No code and it works the same.
Thank you! I downloaded this and it looks SO much better with my MacGourmet cookbook app. Everything else I tried was pretty jacked up, but being able to use MacGourmet without the prior "2X" ugliness is worth it.