Skill - Writing

50 tools that can increase your writing - dumblittleman
150 writing resources
BBC - new words

Breaking News English
Can I have a word - Barbican.org
Collocation of the week
Daily writing tips
English club
English Daily
English Lenguage Gold
English zone
Free english study

Expressions - Daily writing tips
Giude to grammar & writing
IWrite
Quick & Dirty Tips

Thank you letters
The elements of style
The Purdue Online Writing Lab

Misused words - Daily writing tips
Spelling - Daily writing tips
Style - Daily writing tips
Style guide The Economist
Verbix
Vocabulary - .Daily writing tips.
Writing basics - Daily writing tips
Writing Fix
Writing Matters
Writing Problems Explained