The Design Directory of Consultants
A fantastic directory of all sorts of design-based companies, with most including website links to enable you to explore their work and see how design companies or structured.
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