1. This is a great idea. I'm /always/ looking for book recommendations and I find that Goodreads doesn't do the job for me.
2. Thank you for giving me a 'Not yet, I just want to look around' button. This turned a potentially irritating moment to a moment of 'Huh... that's a nice touch'.
3. I'm afraid I say that I think the design is horrible. Not necessarily layout, but more the CSS, e.g. the background colour, the style of the buttons, etc.
4. I think there's too much stuff in the navbar at the top. This includes a few things that I don't really know what to do with. It's all a bit cluttered, and that makes me a bit anxious. Couldn't this be stripped down a bit?
5. The menu is absolutely full of options, some of which seem a bit repetitive. I've got 'Edit my authors', 'Edit my channels', 'Personalise', etc. Isn't there a way all this kind of stuff can be put in one place?
6. When I click 'Edit authors', I'm not really sure why I have to do this on a separate page (or indeed why I'm telling you about /authors/ I like). Can't I just tell you which books I like?
7. I don't really know what 'My Articles' is. I wouldn't mind something that /only/ dealt with books.
8. Loading times are a /bit/ on the slow side, especially on the 'Recommendations' page.
Conclusion: Interesting idea, so I've signed up. For me, the biggest thing that needs to improve is the general look of the site (not necessarily layout, but the CSS), followed by the fact that everything feels a bit cluttered.
This is all just my opinion, though...!