Apologies if this is something previously discussed. I have been using FireFox with the program "StumbleUpon" quite a lot recently and find it a great way to discover some WWW gems. One of the topics you can choose to stumble includes writing and I've come across a few that people might find useful in reviewing or improving their writing.
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Beware! StumbleUpon is addictive and may cause loss of productivity. That said, you can find some really amazing websites or cool inspirational ideas as well.