Ten Things About Writing Dialogue
1. Learn from a master by reading and trying the exercises from Holly Lisle's Dialogue Workshop.
2. 1ConfusedWriter's blog post, Eight Things I've Learned About Writing Dialogue.
3. If you're interested in dialogue software, the demo for Great Dialogue makes it look like a fairly helpful tutorial-style program (would be nicer if there was a free lite version or a demo download, but the program isn't all that expensive.)
4. Romance Writing Tips Group offers the article "Let’s Talk About Dialogue," He Pontificated.
5. Looking for something wise someone else said for your character to quote? Try Feath MacKirin's Quote Generator.
6. Robert J. Sawyer gabs on gabbing in his article Speaking of Dialogue.
7. One of my friends uses Tinderbox to arrange his scenes and dialogue; the home site offers a free demo download.
8. Writer Trick #4 from my old weblog discusses how to use dialogue as well as action to convey emotion versus -ly adverb tags.
9. Author Peder Hill makes some good points at his Writing Effective Dialogue page.
10. Another interesting article with two excellent examples of as-you-know-Bobisms, Writing Good Dialogue by Greg Garrett.