I'm very excited to see that James Huddleston from Apress has announced the upcoming publication of Foundations of F#, by Robert Pickering.  Here's the Apress announcement. The book will be out in March 2007. The description on Amazon (where you can pre-order) promises that this will be "an elegant, comprehensive introduction to all aspects of the language and an incisive guide to using F# for real-world professional development".  I'm acting as Technical Reviewer for the book, so am doing my bit to ensure this is the case.