Try Safari (for everything, esp websites which are heavy on thumbnail images - ebay, b&o etc.)
Apple were advertising it as the 'worlds fastest browser' a few weeks ago but now changed it to 'the worlds best' whatever that means. All I know is between my office using a G4 dual processor mac, which gets a fairly consistent 6.5 - 7mbs connection and at home where the speed varies a lot but probably averages around 4/5 on a basic dell inspiron wireless laptop - Safari on both machines is undoubtedly the quickest.
I have Netscape, Firefox and IE (IE v.old on mac now) and Safari on both the pc and Mac loads sites with intensive images sometimes instantly but drastically quicker than the competition.
Boats and Outboards in Firefox at my office loaded to completion (every last item) this morning in 8seconds (2/3secs of that was blue screen) and Safari did the same in 4 with maybe 1 second on blue screen.