I tried for a year to see eggs, even doing what Cindi says, and never could see them. I think it was because I was nervous about keeping the frame out of the hive for long enough for me to find them. I find it easiest to take pictures of the frames when I look at them. Sometimes I see what I need when I look at the frame, but most of the time I see eggs, brood in all stages, etc. when I come back inside and transfer the pictures to the computer. I see lots more stuff by the computer than at the hive.
That said, this, my second year of beekeeping, I have seen the queen, eggs, brood at various stages when I'm at the hive, but the computer and digital photography is, I think, a great aid to the beekeeper starting out.
Linda T in Atlanta