For a while now, I've sworn by Yves Saint Laurent's Touche Eclat luminizing pen/undereye concealer thingie. It's always on those fashion editor lists as a must-have beauty product, as it really does lightly conceal and brighten your undereye area in one quick swoop. It is, however, $40, so that's always been a bit of a downside.
Recently, I came across a new product from Olay, which made me reconsider my relationship with Touche Eclat. The Olay Total Effects Dark Circle Minimizing Brush -- a clear knockoff -- is half the price, and is a pretty good substitute, especially considering the price.The brush is soft, the clicky-pen function (I should write technical manuals on the side!) works flawlessly, and the tinted cream is sheer enough to be flattering to a multitude of skintones, while still offering some coverage. If you're looking for an incredibly easy way to instantly perk up your eye area, this is a fantastic product.