I never limit myself to just one, so my answer would be some of the above plus others: Lynx, Links, or eLinks for most message boards, forums, and other sites where I don't need images; OffByOne or Dillo for general surfing without the fluff and bloat; Netscape for mail and quick html editing; and Opera or Firefox for sites such as youtube that actually "need" advanced features and plugins like Javascript, Java, shockwave flash, etc.