A site with virtual Dice. Choose a die with 6, 8, 10 or 12 sides. You can customise the dice with text and using wingdings font allows you to have pictures. Great for many activities.
http://ictmagic.wikispaces.com/Maths
This is a vast resource site with activities covering the whole maths curriculum. There is a 'paid for' section, but most of the activities are free and can be used without signing in.
http://ictmagic.wikispaces.com/maths