Have a love/hate relationship with the built-in HTML (rich content) editor for WordPress? Why not give Foliovision’s Foliopress editor a try?
It has a simpler one row toolbar, ability to strip pasted text formatting, and best of all the ability to use simple <br> without them being stripped out like WP’s built-in editor.
It also features a different image upload and library dialog window but we had some problems with adding an image to this post on Firefox for the Mac. It looks promising with larger thumbnails of images in your media library but we couldn’t get it to work at this point.
Update: if you’re looking for something that will allow code like iframe or embed tags, try the Extend KSES plugin here.
Get it: Foliovision’s Foliopress editor