I found that iCab did the best job on pre-OS X Macs. Far from perfect, though.

Just a hint to speed up things try and use the mobile version of the sites you visit, or even better the iPhone version.

For example use http://m.google.com for Gmail, gCal, etc, http://iphone.facebook.com for Facebook, http://m.flickr.com for Flickr…

Enjoy!