In reverse chronological order:
- List of current editor integration modules in contrib
- Gábor Hojtsy: Do not let WYSIWYG editors rule our textareas!
- Fields and places in Drupal core that should support input formats
- Comparison of contrib modules to control input formats
- sun's vision for handling embedded/inline content and Wysiwyg in Drupal
- Gábor's battle plan on Wysiwyg support