Definitely my favorite concealer for 2012 is K-Palette Zero Kuma Concealer. I was ecstatic when I saw this product for the very first time and saw the quality. It was love at first swatch. It gives really good coverage and a little goes a long way. I conceal my undereyes almost every single day so finding a good concealer is very important to me.
K-Palette Zero Kuma Conccealer doesn't cake. It's very creamy and it's easy to blend. I normally set it with a little sheer or loose powder and when I do, it stays on the entire day. The packaging is also very hygienic. It comes in a tube packaging so there's no need to use your fingers to get the product from the packaging.
I loved this product so much that I even made a Current Obsession post about it. All of my other concealers definitely took a step back when I got the Zero Kuma Concealer because it's got everything I wanted and more! ;) There are 3 different variants, do let me know which ones you've already tried.
By the way, K-Palette is available at Beauty Bar. :)