Microsoft Wheel Mouse
See it at Amazon.co.uk for £15.99Average Customer Rating
Amazon Customer Reviews
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The wheel in question, nestled between the two standard buttons cna be used in a variety of ways thanks to the supplied drivers, rolling it up and down whilst in the majority of applications will scroll the page, whilst clicking it then dragging the mouse up and down will allow a semi-automatic scroll action that's great for reading long documents.
The shape is such that it fits the right-handed person superbly well yet this is it's only fault as far as I can see asthere doens't seem to be a version for those who are left-handed.
This aside, my MS Wheel Mouse has been in service for a good couple of years now and is still going strong - the only maintenance has been to scrape out the gunge that naturally collects around the mouse ball.
A great buy and invaluable for the medium to heavy user.