Google Calendar (event info)
Flickr (photo info)
Highlight to indicate inline edit
Show character limit/total
Paste multiple lines (single line context)
Paste multiple lines (multiple line context)
Use explicit save button
Save on click outside
An interesting note, the new facebook interface does not use inline edit for status, but returns to a standard input form with submit button.
What's interesting is that when I look at Google calendar today, they're not making use of the "yellow on rollover" and all fields are already expanded (i.e. you don't have to click in the When field to show all its components; all components are shown from the get-go). Wondering if user research was what led them to change the design? [fluid:DO] Since the user is required to go into edit mode I think new, completely open design, makes sense. The user has already said I want to edit so when they go to the new page they should be able to quickly change anything they want to.