What features would you like in your dream blogging software?

Let me know your thoughts.

Here's what comes to my mind:
Commenting with:
WYSIWYG with shortcuts and buttons and spell checker (Tom Raftery's suggestion)

Strong Spam Protection through:
Blacklist
Trackback Moderation (Should Trackback even be there?)
Keyword (regex) moderation
IP Banning
Referrer Bouncer
Rule based spam checking

Full support for RSS 2.0 & Atom 0.3, Pingback protocols

Offline Blogging support through MT and Blogger protocols

Multi-blog-multi-author

SERP optimized

Update:
Blogging with:
WYSIWYG Editor with special tags enabled and spell-checker (Tom Raftery's suggestion). It should be fast, unlike the WYSIWYG editors in WordPress.

Security Audited.

What else?