http://www.corestandards.org/ The official site for information about the CCSS (Common Core State Standards), which in Missouri we call the CAS (Core Academic Standards). You can also print the standards and appendices from this site.
http://lexile.com/ Look here for all things Lexile! You can use their database to level a book. There are also tons of resources including the research framework for Lexiles, reading lists, a blog, and a video explaining Lexiles that you may want to use as a parent resource.
http://www.fisherandfrey.com/ This is the website/blog of the authors of our Text Complexity go-to book. This content-rich site contains PowerPoints, a Whos-Who in PD blogroll, and other useful information.