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I think a book would be a bit overkill really.
I'd say Relentless Forward Progress by Bryon Powell is a good starter level book, with lots of info, a few schedules etc. Nice and easy to read as well, without being too basic.
The only downside to RFP is that most of the content is available for free on irunfar.com - if you read ultra blogs and a few other sites, you've probably already read 70% of the book.
Still nice to have it all in one place, and available off-line
The other one i'd recommend is A Step Beyond, which you have to order from the States. A lot more in-depth, with some content a bit less relevant as it's race specific (ie Western States, Badwater etc) but a very good book nonetheless, especially as it has a Humour section that is very funny.
Lore of Running - Tim Noakes. Cover to cover.
Anything worth doing, is worth overdoing.
WiB wrote (see)
Lore of Running - Tim Noakes. Cover to cover. Anything worth doing, is worth overdoing.
I seriously couldn't finish it! I dip in and out occasionally if I want to know something specific... The biggest drawback with that is the ultra section is a bit heavily biased to Comrades from memory...