I'm currently looking at purchasing a few C# 4.0 books, namely:
Essential C# 4.0 by Mark Michaelis or C# 4.0 Unleashed by Bart De Smet.
I am aware that both books are yet to be released, but would you consider purchasing either of these books, or would you recommend another?
Thanks for your time.
Clarification:
I'm not a .net Ninja, but I do have 8+ years experience with the framework & related languages. So I'm generally looking for in-depth books. I also train/instruct the rest of my organisation generally 6 - 12 months after each .net release. Each of the developers I train has the same or more .net experience then myself.
Once again thank you all for your time.
Update:
Thank you everyone for your responses. I've decided to purchase both books along with Visual C# 2010 Recipes: A Problem-Solution Approach, as suggested by Waleed Al Balooshi.