Hi - I've just put a new version online. Since last time, i have done some work on the index (it's pretty good up to 'e' now). I've sorted out some problems with the description of sparse linear regression and relevance vector regression. I've also added sections on relevance vector classification; trees, forests and ferns; and a comparison to non-probabilistic classification methods. I've sorted out a lot of small problems, especially in chapters 8-14.
It's definitely going to be a little while before the book is complete (perhaps end of July?), so please if you read this, send me any comments / errata / feedback. A few people have already mailed me and its made a massive difference to the final product.