Got the same on my R1100GS, i think most of the bikes have that problem - rubber wears and it gives colour to your hands
Mostly i drive with mc gloves. So it's no problem.
But in real hot conditions I use light cloves, bought them for a penny from tool's shop, and i cut off the finger's upper parts, so they breathe very good. So they look like the gloves the street-skaters use with naked fingers, are halfly from leather, very comfortible, and my hands never sweat - lot of air comes through fingerholes on driving. I don't have to take them off doing some detailed fingerjob as counting money in fuel station or browsing map or adjusting something on the bike.
Another reason i'm using them is the sun - on my previous trip i had my hands burned driving without the gloves. But with those lightweight ones you'r fingers are below the handgrips, so no burning sun for them too.
[This message has been edited by Margus (edited 22 July 2005).]