I thought to myself the other day that I don't think I'd ever seen a game that had user-resizable UI panels (at least not freely draggable ones). Though I'm also aware that not everyone using CEGUI is writing a game
Yeah, the project I work on is not a typical game though ultimately it is a game. I use draggable/resizable windows for everything. Like Tiblanc, a lot of my windows are lists, editboxes, graphs, etc. I actually don't have any static-gui windows in my project. The other reason is that I use absolute-values for positioning and sizing (no auto-scaling) and our target audience will have a wide-range of resolutions; larger resolutions will show more scenery and thus allows for larger windows as well. So there will definitely be some dragging/resizing going on, but once in place should not be changed very often.