I can't say enough good things about Rimmel's Lycra Lash Extender mascara.  I use it daily and just one or two coats do the trick.

Since my eyelashes are completely blonde, I need a good mascara that will cover thoroughly and darken without having to use five coats.  This product definitely delivers. 

Using other mascaras, I would sometimes have to pile on several coats just to have my lashes visible, but with Rimmel's product, I simply put on a coat and go!

Other "lengthening" mascaras have made the same claims that they curl your lashes and leave no clumps, but I had no luck with those...