I only have one so far - Essential C# 4.0 - and the formatting is just fine. Even the source code samples look good (they seem to have used images for those(?)) That said, I guess it ultimately depends on how good a conversion job the publisher does.
I also have a few technical PDFs that look alright as well, and a couple that aren't so great.
Edit: That's using a DX. I noticed that a lot of Kindle technical books have a note saying that they're optimized for larger screens, so things may not be so great on a K3, for example.
Last edited by MichelRenaud; 02-08-2011 at 08:27 AM.