Honestly? The free services for tracking Level 2's aren't a good idea. They run on a 15 minute delay, and that's useless in the penny market.. actually most markets!
I used to have Alphatrade, but switched to Ihubs Level 2, and it works great, and for less $$ than Alphatrade. You could ask Ihub Admin Matt for a 1 week free trial.. I don't know if the free trials are over or not, but try asking Matt on this board: http://investorshub.advfn.com/boards/board.aspx?board_id=8689