Initially I planned on making a full integration (no limits, bound to a NotesRichtextItem). Unfortunately, this is impossible using regular XPages components. I've tried a lot of hacks (rendererType, converting the field in different events, and a lot of other stuff I know nothing about), but so far I've been unable to make the integration work with the native XPages Rich Text editor control.
The last person that requested the integration was "fine" with a 32k limit on the demo, so I've extended the CKEditor Integration demo with a demo of XPages integration (bound to a regular text field).
Read the blog entry on CKEditor integration for prerequisites (CKEditor installed in a certain directory on the server).
>> Demoapp of CKEditor integration with Domino form and XPages