I have been day trading penny stocks part-time and it has been fun and profitable. Robinhood.com, the future of stock trading with 0% commission, paved way for me to trade without pressure. My regular trades are XCO, sprint, CDTI, ZNGA, OHGI, AMS,TOPS, GMO, RGLS, GSL, NAO, TEUM. I am usually in and out of trade within an hours, I rarely do next day trades. Penny stocks are mainly for fishermen like traders who can wait patiently for the market to come to them.
Robinhood is not available in Nigeria / Africa, you have to be residence in U.S.A or Canada to signup using the app.

Join Robinhood with this link if you are residence in U.S/Canada and we both get a free share each http://share.robinhood.com/kenneti9

The free stock is only available through invitation using the link, Robinhood does not award free share for signups without invitation.

*Awarded shares can be sold after 3 trading days.