Royal Institute of British Architects (RIBA)
The main Institute that regulates all architects, lots of current & relevant information.
The main organisation which promotes the purpose and importance of design. some great resources available.
A weekly web-magazine on all things design. Has some great current case-studies.
An on-line magazine in relation to current affairs in Architecture
GENERAL USEFUL DESIGN RELATED WEBSITES
General Glossary of Architecture Terms
A general page full of architectural terms, which are really useful for any architecture project