Satourne (http://satourne.consollection.com/) 2.0 will be released soon and it looks really promising... can't wait to hear if SF3 will be playable (which would enforce a major speed up but we'll see).
Als Yabause (http://yabause.sourceforge.net/) looks promising as it evolves rather fast. Next to that they have a nice april fools day joke on their website (http://yabause.sourceforge.net/screenshots.php).
As the Sega emulator did already a fine job I'm really looking forward to these two and hopefully we will get an emulator capable of SF3 this year.
Last but not least as I am talking about emulators I should also add the URL of chankast - the only avaible DC emulator - http://www.chanka.org/
'nuff said
