I noticed that when using position: fixed on an element, the text on the iPad (iOS 5.0.1) is being rendered better than without position: fixed. This is especially the case for white text on darker background.
My question is how to make use of this improved anti-aliasing without using workarounds such as position: fixed.
Below you can find an example picture and the corresponding code.

After updating to iOS 5 I wasn’t able to reproduce this anymore – weird.