Here's a link to a discussion on the newly available Canon chip resetter(s).
I'm still using iP3000. 4000 and 5000 but it's nice to see that I can step up to the newer models (someday) and maintain my current re-filling effectiveness.
A little spendy just yet, but hopefully the price will come down.
http://www.nifty-stuff.com/forum/viewtopic.php?id=3013