Ten essential reference sites for writers

Struggling to find inspiration for that blog post on your to-do list, or that press release that's due next week?

Here are ten reference sites that every writer needs to bookmark:

• The Taxonomy of Logical Fallacies
• A Handbook of rhetorical devices
• Data Visualization: Modern Approaches
• MBA in a Page (hat tip to Guy Kawasaki)
• Refdesk.com
• Word spy - a dictionary of neologisms
• Purdue's Online Writing Lab - grammar and writing guidelines
• Economist Style Guide online
• Wikipedia. I'm against using it as a primary source but it's a great place to start your research

Any other suggestions for essential reference sites we may have missed?