I have a CapitalOne NoHassle Rewards Cash back card. 1% cash back on everything, 2% on gas and groceries. No annual fee and no international fee when I use it out of country (which I really like).
That particular card with the 50% cash back bonus and $100 sign up looks great too.
I haven't had any problems with CapitalOne. They are sticklers about increasing your credit limit, I ask about once a year or every other year just for kicks really, since I never spend more than $900 a month on credit cards and my limit is $7500. But Chase is like that too and probably a lot of other card companies these days. The online web site is easy, convenient, and intuitive enough. They also send you an annual report at the end of the calendar year that breaks down a lot of your past spending which is kinda neat.