You can get a 180 Day Free trial (Link on the right hand side) here if you want to
(I dont know how much experience you have - and what your preffered learning style is)
A good website for this and similar is:
Probably a bit more relavent to you on this website is:
I'd have a read through these, then maybe try the trial? I dont think theres a whole lot of books on the newest version 2008, so if you wanted something with a bit more coverage, or wanted to learn an earlier version of SQL Server, try the 2005 Version.