How much money are you planning on investing? Using stock trading websites is only worth it if you have a few grand to put in it.
If you are looking for something long term think about investing in agricultural or natural resource industries. The demand is only going to rise as developing nations catch up to the US. As oil reaches 100$ a barrel, smaller oil companies have a greater output because they can cost effectively harvest from oil sands. Alternative energy sources tend to spike as the oil price rises as well.
If you are thinking about something a little more volitile,(and probably have a bit more cash) my dad's invention Diamabrush which he finished developing with funding from Malisch was licensed out to Tennant last year. Sales are just beginning to pick up on that production. They're supposed to be supplying the US costco's soon but i haven't heard much news on that in a little while.