Update: This has now been included in the 6.x-2.33 release of Drupal’s YUI Editor module and I have added support for YUI 2.6.
Earlier today I finished off another Drupal based site. The client was pretty happy with it. Once they launch I will probably post a link.
The client came back to me and asked how they could insert images using the rich text editor. Based on some positive reviews I used the YUI Editor module this time around, instead of FCKEditor or tinyMCE for the rich text editor.