Here is some really cool ones in steel. http://www.boltz.com/multimedia/index.stm
Have not ordered one for myself yet as i don't have room for it, but when i move i'll get one (I still live with my parents ).
Goto http://www.google.co.uk and search for "wooden dvd rack" (substitute wooden with metal / plastic / glass etc).
You may be surprised at what you can find (make sure you select the 'UK sites only').
Saying that I got a couple of flat pack wooden cd / dvd racks (5 shelves, 4 ft high and 2 ft wide) from Mackro's for around £7 each. They are cheap and not as well made as they could be (not varnished etc) but with a little work (light sanding, varnishing / staining) they could look pucker. They are also quite light and so can be moved around quite easily.