Hi, obrienkev.
If you go to each of the exams' description pages, you can see a list of study resources near the bottom - often times including a training video just for that exam!
Otherwise, SQL BOL and perhaps the SQL 2008 resources (such as the books for 70-448) can be helpful as well.
Check out:
http://www.microsoftvirtualacademy.com
Good luck!
Best wishes, Davin Mickelson