Can you recommend some sunscreen?

With the weather getting warmer these days, I've been increasingly concerned about sun protection. My skin is particularly sensitive, so I'm wary of using just any product. Could you recommend a gentle sunscreen that doesn't leave a white cast?

I'm curious about a list of sunscreen recommendations that adhere lightly without leaving a greasy feeling, even on oily skin. If you've recently tried a sunscreen and settled on one, could you share your favorite?