I've read many different books on riding in an effort to become a better rider.  Most of them are copyrighted material that you need to pay for but a few years ago I stumbled across this free PDF of a book put out by the Norwegian Motorcycle Union.  It's fairly concise (57 pages) and contains lots of good riding advice.  It's quite good in my opinion and if you read it several times and practice the techniques described therein then you'll probably end up being a better and safer rider - as well as having more fun.  As an added bonus, the second to the last bike in the cover picture is a K100RS!

Click here to download a PDF of Full Control