I have an unlocked Treo 600 with AT & T that has unlimited nights and weekends. I would like the best way to surf the net and read email unlimited, without worrying about my minutes. Should I go with AT & T Mmode at @ $24.99 (quite expensive) or go with AT & T Worldnet or Earthlink ISP?

Also do I need a third party software to read email and surf the net?
Thanks.