Another contender in the electric storage system wars using SLA - EFFPower:
Looks readily adaptable to all forms of electric transport including bicycles with mass production by 2010:
http://www.effpower.com/
We'll see. Firefly and EFFPower are two major players in advanced SLA technology and both are readily adaptable to bicycles if suitable batteries are produced. We'll likely see a whole array of competing electrolytes and electrodes in the near future with LA remaining dominant. Personally, I'm sticking with LA until a major breakthrough occurs with another chemistry, e.g. Ni-Li, with multiple electrolytes.