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I spent some time with Moon+ Reader over the weekend. Though not as visually pleasing as Aldiko Premium and in need of fine tuning, it's not bad at all. Font selection is horrible, so I imported my own fonts using the SD card (/sdcard/fonts). There's much tweaking to be done to get your lay out on screen so that it satisfies you. Some of this involves manipulating the font scale to get rid of excess space between letters and words.

What sets the app apart from Aldiko are textured/fabric backgrounds (love this!), page turns that resemble a physical book (set mine to lowest speed), and the ability to highlight and make notes. You can also export bookmarks, highlights and notes. Oh, one thing that I really wish Aldiko had is the ability to make the text bold/darker (wouldn't be a big deal if I could import fonts). Moon+ Reader has this option and it looks great on textured backgrounds.

Edit: Forgot to mention that books must be DRM-free.