Randy Byrne and I have just received our first copies of our book, Programming Applications for Microsoft Office Outlook 2007. This means that it should be showing up in your local book retailer or super-mega-online-bookstore very soon (like over on Amazon). While I'm probably a little partial since I'm a co-author of the book, but I think this is really a great guide for developing add-ins and application solutions using Outlook 2007. The book covers everything from writing your first add-in to advanced topics like using the PropertyAcessor and creating solutions with form regions. Randy and I both have put a lot of effort into this book to make it what should become the standard reference for any Outlook developer.
Depending on when you see this, you might notice that my name isn't listed on the online book retailers. Don't worry though, it's there on the real copies of the book :).
If you pick up a copy, let me know what you think about the book. You can also rate the book over on the MS Press website, if you want to provide feedback in a more managed way.