This is an article posted by Smashing Magazine. A good majority of the links are related to copywriting and blogging. More are dedicated to grammar, which isn’t a bad thing. Based on some of the writing I’ve seen out there, this is a very good thing.
There are a few golden nuggets. One is a reverse dictionary. I know I get stuck sometimes because I can think of the meaning of the word I want, but not the word. Another offered text analysis. Some of the links take you to other sites that offer more free writing resources.
May the muse be with you,