Soundproof Room
Casual noise problems can be reduced to a tolerable level by simply adding mass to existing walls, floors and ceilings. Mass Loaded Vinyl, Underlayment or Green Glue with drywall are effective ways to add additional mass to your surfaces. However, if you want to achieve significant sound isolation then a dedicated room construction is in order. Learn about how to decouple from Soundproofing Company with their soundproofing article on building a " Room within a Room.
http://www.ecophon.co.uk/templates/weblistpage____93510.aspx - the high end (from http://www.blue-room.org.uk/lofiversion/index.php/t12552.html)
http://www.sitester.com/style/Sitesterlager50px.gif
http://www.trasoffice.com/Panel_System_Office_Furniture.htm - new and used office furniture (Partitions)
http://www.officeworld.com/Worlds-Biggest-Selection/SCXCFSL6013CG/08Q1/ - maybe something like this?
http://www.buildingdesign.co.uk/arch-3/sound-control-services/sound-control.htm
http://www.umass.edu/bmatwt/publications/articles/creating_soundproof_office.html
http://findarticles.com/p/articles/mi_m1563/is_10_17/ai_56063073