My glasses make my ears stick out, and since my hair is very fine and mostly straight, covering my ears is not an option. There just isn't enough hair to do the job. To solve the problem, I make sure that my hair is not pulled back too tightly. Hair combs, as someone else suggested, also help to provide lift to the hair behind you ears. If I put my hair in a ponytail, I use my fingers to push forward on the sides of my head to loosen the hair from the elastic band a little. Also, head bands can be a real help if you like them; the band itself creates some bulk behind your ears and also lets you create the little poof in your hair. I also bought a fabric head band at Claire's Boutique. It has elastic at the bottom of it so that I can wear it over the tips of my ears or just behind--I love it!

Here are some sites with the kind of fabric head band I'm talking about:
http://marketplaceadvisor.channeladv...pid=751&dfid=1
http://serenitycrystals.com/Head-Ban...source=froogle