One of my favorites for lengthening is Lancome Definicils Mascara. I also just used their Hypnose Doll Lash Mascara and that was good too. Maybelline Great Lash is always fabulous. Another good one is Benefit, "They're Real" Mascara!

I love mascara and always am on the search for one that works better.
A few mascaras that I have liked for fuller and longer lashes are...

Maybelline Great Lash Washable Mascara
Rimmel Lash Accelerator Mascara with Grow-Lash Complex
Mac Zoom Lash
YSL Shocking Mascara
Makeup Forever Smoky Lash

Try using a eyelash curler as well to help curl your lashes up and making them appear to be longer!

You can try Latisse. This will give you unbelievably long, thick lashes-without the trouble of mascara smudges.