Audiobooks (.M4B) on Android phones

Well today I’m on the iPhone 4, however when I had my HTC Wildfire Android phone I was missing a good Audiobook player but never did manage to find one..  Now when it is not that important I by accident stumbled across this one; http://www.astroplayer.com/ which seem to support the very important .M4B format (the format for most of my audiobooks as I had an iPod before).