Free eBook: The Definitive Guide to Exchange Disaster Recovery and Availability
William Lefkovics just blogged about this, should be worth a read.
Realtime Publishers, Content Central, and XOSoft have teamed up with Paul Robichaux to publish a free eBook called The Definitive Guide to Exchange Disaster Recovery and Availability.
The book is free to download from Content Central, but you will have to register on the site for access. It seems they will release this chapter by chapter. Chapter 1 is completed and available now.
http://hellomate.typepad.com/exchange/2005/05/free_ebook_the_.html