It would be great to develop edit-in-place capability where you can be viewing a page and click on the content and have it turn into an editable text area without going to a separate edit form, or be viewing a Views list and click on a field in the list and have it turn into an editable field that you can use to update the value. When using this with Views, it could almost be like having spreadsheet capabilities. This would be a killer feature.
There were people talking about this at one time, but I don't think anything ever got done. Anyone interested in this should do some research to see what, if any, work has happened in the past that you could maybe build on. There was a jQuery edit-in-place plugin somewhere that I thought might be useful for this, but I can't find it now.
Unfortunately, I don't have time to flesh this idea out more, but would love to see something happen here, so if there's interest, maybe others can jump in.