R is for Research:
- All Experts - This is a fantastic place to find a "real life" expert for your toughest questions. Just be sure to check out their credentials.
- TV Tropes - This site reminds me of the awesome DPK. Tropes galore!
- Lydia Kang's Medical Mondays & Redwood's Medical Edge - Both have a great collection of medical facts for fiction.
How do you do your research?