Here's a list of sites we recommend.

Writers' sites
Online thesaurus	Shows hypertext can be quicker than flicking through paper, if you can put up with the ads.
Useit	Good background information for building and writing usable websites.
The Economist Style Guide	Online version of the book they give to all their journos.
The Guardian Style Guide	Style bible for Guardian writers.
World Wide Words	Vast, eclectic and opinionated lexical resource.
The Plain English Campaign	People on our wavelength. Good examples.
Clickz	Background info on web marketing and writing.

Newsletters, news sites and blogs. It's no coincidence that the sites we find useful are all great examples of the power of good, straightforward writing:
Free Pint	Well-written and useful newsletter and website.
NTK	Text-only, witty, weekly, geeky.
Treehugger	Best of the green blogs from a writing point of view.
The Register	Online tabloid for the tech sector with strong views.
Good Morning Silicon Valley	Does what it says on the tin, with irreverence.
The Onion	Finely-crafted satire.

Other sites that put good writing into practice
Rivendell Bicycles	Skillfully written, straight from the heart, by people who know their stuff.
Rapha	Tasteful cycling gear promoted with tales of cycling suffering.
Berkshire Hathaway	Warren Buffet's company has plain writing and site design down to a fine art.
The Free Software Foundation	Plain speaking and design from the heart of the Open Source movement.

Miscellany
Edward Tufte's site	Many joys, including 'The Cognitive Style of Powerpoint'.

Complementary services
Scratchmedia	The web consultants who upgraded this site.
Chalk Design	Design company responsible, among other things, for the Plain Text corporate ID.
SiteVisibility	Web marketing and search engine promotion.
Jet Web Design	Web design company offering a range of branding services including stationery and logo design.