I migrated from Dotclear (2.2) to WordPress (3.0) a few days ago and I have solved all my problems except one. I have not found a pluging to handle "french spacing".
WordPress is better than Dotclear, but since Dotclear is a French project, it manages this correctly.
By "french spacing", I mean replacing the space by an insecable space ( ) before the double punctuation (: ; ! and ?).
I tried "WP-typography" but it doesn't handle this specificity of French language.