The Sanctuary Liquid Foot Powder
More for summer toes than crusty winter feet, but acts like talc when you're wearing shoes without socks (e.g. ballet pumps) but without it going everywhere as it's a lotion that dries to a powder.
Smells DIVINE too.
Not always easy to get in Boots or wherever but only four quid and lasts ages as you don't need to put too much on.
Seriously I give this 9.5/10
I also highly recommend Revlon Red nail varnish (though can't find a proper link to it, it's the colour of the big bottle on that page)
It's a great colour for toes all year round though I'm usually a Bourjois girl for nail polish.