Thanks, I've tried GoodReader - impressive app, but it does not seem to be geared towards simple reading, at least I don't feel it's convenient enough for that. But thanks for suggestions.
I'm really looking for something that can read PDFs natively, without conversion - it's very difficult to convert scientific papers, and even basic books that I read loose something or look strange after conversion. And I don't want to have an extra step for every book I read.
I'm thinking of developing an app myself for that, as I can see there are not many like this. Anyone interested in trying?