if you sell them face to face, there shouldn't be a problem, they can't track you
and if you pay the taxes at the end, i don't see how it would be illegal to sell bitcoin, but i'll try to stay below 1k a day, because of the AML
You still might get in trouble,, as I wouldn't trust cops to just sit back and watch. They might get involved in a trade as well.
Here is an indictment from one of the forum members;
http://www.scribd.com/doc/248973784/Bitcoin-indictment .
Beyond 1000$ you are considered to be running money transmitting business affecting interstate and foreign commerce