I use urban decay eye primer and then smashbox cream eyeliner. It is in a small pot and you just pat the eyeliner brush in it and more or less walk it across your lashline--you can also wing it out very easily as well.
I'm gonna have to agree with some of the other ladies...Mac Fluidline! It's amazing! Doesn't budge at all. I put it on at 7 am it's still there by midnight. I highly recommend it.
Yes to everyone who said Bobbi Brown Gel Eyeliner! It's the best eyeliner I've ever used and it definitely stays put. Very water resistant. It's fairly easy to apply, just use the eyeliner brush that they recommend with it.
I started using Shu uemura's liquid eyeliner (when I was in Tokyo) and I love it! It lasts through a good work day and doesn't smudge. Before that I used to use Clinique's twist-pencil liner (not sure what it's called) and it was fairly good.