For audio books, I'd use a client that has access to the eD2k network, which is what is suited best for that content. gnutella may be larger than eD2k, but it is better for small and medium sized files, whereas eD2k is more efficient on big files.
You might want to try out Shareaza, as the client has both, gnutella and eD2k support.


mfg,
Old

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</td><td><a href="http://crawler.trillinux.org"><img align="right" style="border:0" src="http://crawler.trillinux.org/img/netsize.png" alt="Network size"></a></td></table>