In my view most of the boos are good.. (I like books :-) ). Apart from suggested above, there is also a book called
Professional SQL Server Reporting Services, you can buy on
Amazone.
Another very good online resources I always consider is
MSDN books. Also, I normally attend few web casts and then tutorials, labs etc from MSDN while learning new Microsoft Technologies. Apart from this you could search for blogs, articles on Internet search engine.
Once you start doing development, if you face any problems there are many community forums where you can get help like
MSDN, and obviously EggHeadCafe, etc..