I have really been enjoying make up brushes recently, in case you can't tell! It is very true that the tools you use to apply make up can make all the difference to the final result, and so different brushes can help you vary application and how a product looks on you.
Royal lip brush from iazua.com and I really like it. The fine, tapered tip of the brush makes applying lipstick accurately such a breeze. It applies it precisely and lightly, almost like adding a stain to your lips, but of course this can be built up too.