Hardware 
1. AP Cables
Offers a wide selection of high performance cables and computer accessories, including home networking, fiber optics, switch boxes, jacks, firewire, and keyboards.
http://www.apcables.com/
UK reseller of new and refurbished computer hardware - servers, networking equipment, network storage, SCSI drives, switches, routers, memory, desktop PCs, and laptops. Brands include Cisco, HP, IBM, sun, Compaq, 3com. Daily shipping throughout the EU.
http://www.bluegoosesystems.co.uk/
3. CableJoG Ltd
Product descriptions and specifications of cable testers, Cheshire, UK.
http://www.cablejog.co.uk/
4. CityLink PCs
Online computer hardware shop that also features PC help guides and articles, technology tutorials, free userguides for hardware and software, computer buyer guides, tech tips, free computing advice, and other free computer-related reference material.
http://www.citylinkpcs.com.au/
Memory upgrades for desktops, notebooks, servers, printers, routers, and digital cameras. Based in Oklamhoma, USA.
http://www.edgetechcorp.com/
6. Install Whiz
Provides cables, display units, and storage drives, power protection devices, and networking options for personal computers. Based in Cincinnati, Ohio.
http://www.installwhiz.com/
New and used laptops, computers, accessories, and batteries. Based in Manchester, England.
http://www.itfactory.co.uk/
UK based specialist retailer of computers and components using the Mini-ITX form factor.
http://www.itx-warehouse.co.uk/
Distributor of a complete range of CD and DVD copier, duplicator, and printer equipment. CD and DVD media and packaging is also available. Based in Basingstoke, UK.
http://www.magellanhardware.com/
10. Memory4Less 
Specializes in new, used, and refurbished parts for notebooks and desktops including servers, hard and floppy drives, memory power supplies, or cables.
http://www.memory4less.net/
Network cables for any size business or home. Audio and video cables for home or business. Many other computer cables including USB cables and hubs, monitor cables, and more.
http://www.networkcablesonline.com/
Retails new and refurbished IBM systems and accessories such as AS/400 9406, eServer, i5 and iSeries server, printers and accessories, memory, modems, disks, tapes, print servers, print heads, and terminals.
http://www.perfdata.com/
13. PockeTec
Offers firewire and USB2 removable and portable hard drive solutions. Also has device drivers available for download.
http://www.pocketec.net/
14. PowerFacter, LLC
Offers switching and special purpose power supplies along with accessories. Located in Las Vegas, Nevada.
http://www.power-factor-1st.com/
15. Pure Silence
Specialises in silent cooling products for PCs: silent fans, CPU heatsinks, VGA coolers and power supplies.
http://www.puresilence.co.uk/
Specializes in desktop and laptop RAM memory upgrades for Dell, Hewlett Packard, Compaq, IBM, Gateway, Apple, E-Machines, Sony, and Toshiba computers. Based in Boulder, Colorado.
http://www.upgradememory.com/
Online store for routers, modems, broadband equipment, with a large Zyxel stock.
http://www.worldzonestore.co.uk/