I found this site called TopMarks today and it is based out of the UK. It has tons of links to different stages of material from early learners to advanced learners. The site is amazing. Be sure to check out the Ineteractive Whiteboard Resources section for use with your SMART boards. Enjoy!
Main Site URL: http://www.topmarks.co.uk/
Interactive Resources URL: http://www.topmarks.co.uk/Interactive.aspx