First of all i prefer a clean input form without an editor. But of course in many circumstances it may be needed. I needed this specifically to be able to easily insert images, but there are also direct applications that can do this without the editor, similar to the way Ubercart handles it.
Installing ckeditor is not straightforward, if you're not experienced with it. I already installed Wysiwyg from http://drupal.org/project/wysiwyg.
One set of instructions is in your wysiwyg admin Site configuratinon > Wysiwyg profiles. Another set of instructions is on the ckeditor web site http://docs.cksource.com/CKEditor_for_Drupal/Installation They're completely at odds with each other. The
Searching the net. I usually prefer written instructions, but here's a video: http://jesox.com/posts/how-install-and-configure-ckeditor-module No mention of the Wysiwyg (api) module. The video downloads and installs a http://drupal.org/project/ckeditor as usual into modules and then download the other file from the ckeditor site, drop it into the module and extract it right there. It appears to work in the video. But what about the Wysiwyg (api) module? And what about that libaries (api) that I've got in modules?
Well. Time to experiment. After some failed experiments, this, with the original wysiwyg instructions as experimentation guide:
Dropping the ckeditor 3.6.2.x file from the ckeditor site into all/libraries, deleting all ckeditor files except the ckeditor directory with the .js files in it. Moving things around so that only the ckeditor directory with the .js in it is directly beneath all/libraries. Refreshing Wysiwyg profiles page and ... yes. It's there.
Well.