Now I remember another point about profilebook.
On my site I had to disable the "feedback" link because many users got very annoyed that the original poster of the entry didn't react/reply to their feedback. There are several ways to possibly improve this.
- option to notify the user if there was feedback to their entry
- option to merge the feedback and return gesture options so that the feedback is posted to the original poster's wall/book (if enabled) simultaneously
- other way?
edit:
An option to use anchors for profile tabs. My users are easily annoyed with scrolling. E.g. they want their profilebook notification to directly take them to their book/wall/blog. The link's getxytab part does display the corresponding tab on top, but an additional # to directly jump to that tab would be awesome.