Just found a fabulous little DAISY reader application for mobile phones. It requires Talks 4 and a series 3 handset, but if you already have these, its a free download. On first glance, it makes books very navigable on a mobile phone, and the sound quality, particularly on my E51, is brilliant.
I love specialist software that runs on mainstream platforms. No need for me for any of those specialist players that look so awful. I can listen to books on the move on my very sleek and stylish phone.
the player can be found at http://www.talknav.com/downloads.