When choosing a theme, focus on something that is clean and uncluttered. Please refrain from going for anything particularly striking or “flashy” – it’ll typically result in a blog design that is not conducive to reader retention. Social Triggers is a great example of how a clean and simple design with plenty of whitespace offers an experience that is easy on the eye.
Thanks for this guide. It’s 100 times better than those rubbish clickbank ebooks selling for $47. I’ve recently checked out Woothemes and they’re quite beautiful and customizable (I took advantage of the test ground facility). I’m currently using Daily (premium theme from Theme Junkie) and I think it reflects the ideal blogging theme you described above.