I have struggled a lot with finding the best theme, but I still haven't found it.
The new themes are all good-looking, shiny and flashy and so on, but my old pre-theme layouts still is better for entering and working with information in the long run. At least that's my and my clients opinion. It's hard to specify what's wrong really, but many of the themes are "blurry", and with that I think I mean that they have too little contrast. But I'm not sure, it's just a feeling I have.
How about you guys? Do you understand what I mean? Have you found a good theme that's easy to work with, or have you made one yourself?
BTW, do you know a place to download more themes?