I've got to say ... randomly, that if you feel you need something to cover dark circles beneath the eyes ... it's Bare minerals every time:
www.bareminerals.co.uk
http://www.youtube.com/watch?v=_UCRTyLMRNQ
As I'm up late far too often and clearly don't drink enough water [please don't copy these poor standards at home people], I've found the perfect powder to hide my imperfect life style.
Stays on all day - or night.
Just remember to put your usual colours on top - or you may have white panda-eyes ...
Enjoy
Gillian