Resources Elsewhere

Emaths.co.uk is a very useful site.  Lots of good stuff on there but it's particularly great for:
Subtangent.com has lots of good resources on it, such as various graph papers, but I mostly use it for games and investigations.

Transum.org has a very nice Starter of the Day section.

EveryMathsTopic.com also looks pretty handy, and has quite useful Starters and Plenaries pages.