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POPSCorrect use of the comma I found this blog while reading my favorite blog Micropersuasion and I haven't read all the posts but he seems to cover helpful grammer topics with lots of links to sources and other writing materials.
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POPS50 Writing Tools I notice that some people here try to build up their fragile egos by using doublespeak when actually they only come across as a book-snob. I usually just feel sorry for them. Here's a great site with 50 writing suggestions that might help bring those people back down to earth. Remember, it's OK to keep it simple.
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POPSSome really great tips on writing These articles are written by a former teacher. Most are relatively short and easy to follow. Make sure you visit the original page for the whole list.
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POPSWiki for cooperative fiction writing Some pretty cool stuff for those interested in fiction writing. Be aware that rights for work submitted may be limited or non-existant (see the link at the bottom of the clip)
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POPSFree Dictionaries, encyclopedias, word games, etc. Lots of free stuff here--dictionaries, thesaurus, encyclopedias, word games, quotations, etc.. Has a customizable homepage with all the above and more. I mostly play the "Match Up" game straight from Personalized Google homepage, but I poke around here now and then.