Pics to follow but as a taster:-
These are stand-alone heavy duty shelf racks, each one 1.9 metres high (6ft 3ins), 3ft wide and 1ft deep. The racks are boltless knock-together and are identical to these on eBay:-
http://cgi.ebay.co.uk/SHELVING-Garage-S ... 20afc14911
... except that mine are slightly taller, are powder coated blue and have 18mm chipboard shelves rather than the 9mm ones, so probably take a bit more weight - just one of my shelves had three Rover gearboxes on it!
Also, you can put 6 shelves on each unit rather than 5.
Used once on a short-term project, these are immensely strong and would solve many storage problems.
I'm looking for £25 for a 5 shelf unit and £30 for a 6 shelf one.
Old enough to know better!