I wish there were a way to have your collections in two columns.
I used the sort by collection view, but if you have more than 9 collections it pushes your most recent book off the first page into the second.
I guess for most people this isn't a big deal, but I typically only put my books in a collection once I've done reading it.
So anyway, I first started out trying to use a collection for each author, but now I just do it for genre:
Which so far works, but I've only got about 150 books on it and about 50 in collections.