Plain English Campaign

The Plain English Campaign describes itself as

an independent pressure group fighting for public information to be written in plain English. We have more than 10,000 registered supporters in 80 countries.

'Public information' means anything people have to read to get by in their daily lives.

'Plain English' is language that the intended audience can understand and act upon from a single reading.

Their web site is full of fun stuff, such as the annual Golden Bull and Foot In Mouth awards, and the Gobbledygook Generator. They also have some useful stuff, such as How to Write in Plain English and the A-Z of Alternate Words, a compendium of wordy phrases paired with less-wordy substitutes.