I don't have enough knowledge on whats available at the moment, especially when it comes to lite usage.
I think it would be somewhere in the region of 1 hour a day in the evenings to check email and maybe look up other information.
Not sure what the cheapest way to do it would be? PAYG 56? Offpeak 56k? Or very lite ADSL connection?
I don't even know who provides 56k service anymore