OK came across this on SinfuliPhone :

You need to use Stanza for this.

Just add http://www.drinkmalk.com/books/list.xml to your book sources in Stanza. You can call the source whatever you want.
Once saved you can access the source and Viola you have a shit load of books that you can download directly to your idevice. Just d'loaded all of David Gemmells books which I do own on Hard/Paperback anyway !

Happy days