RiPWiRE is best known by many for being one of the retail providers for the FTTC Digital Region service in South Yorkshire. Alas it seems RiPWiRE has ceased trading according to a post from Liam Winder on the RiPWiRE support forums, importantly for customers their connections are still working.
The communication purported to be from RiPWiRE indicates that while they have ceased trading, they will continue to provide service while negotiating with another provider to sell the customer base. RiPWiRE did not solely service Digital Region customers, they also provided a variety of wireless connectivity (28GHz Microwave for heavy lift back-haul, 802.16d 3.6GHz WiMAX connectivity).
The Digital Region website now lists the four providers, ask4, Origin, unitel and littlebigone and is very much still operating, though the costs of running a new network in the face of increasing competition in the superfast arena from Virgin Media and the BT Group are not helping the project.
Updated 07/02/12: Ask4 have announced that they have taken over the RiPWiRE service and customers.