It would be nice if the timesheet information for a case were displayed in the case's history. I feel that this would provide easier access to information that is already being recorded in the system, would prove to be informative to anyone reviewing a case's history, and ultimately provide more value to more users of the timesheet features of fogbugz.
The case history text would simply be something like
"Worked on by Jack Black for 3 hours on 5/13/2011 10:46 AM"
Example 1: John assigns Jack a case to work on, and Jack spends 3 hours doing research on how to accomplish the fix for that task. Jack logs the 3 hours using the "working on" feature, and when finished with his research, edits the case and places his findings there. John checks the case later and sees the update, but thinks it would have been nice to see the timesheet information in-line on the case history to get a general idea of how long Jack had spent working on the case prior to that update.
Example 2: A company has a forward-facing cases system so that their users can see the status of cases they have permissions to see. A developer may have logged many hours on a case that a user has interest in, but the developer's logged work does not show on the case history, and the user feels that nothing is being done about their problem. The user may have felt reassured to see that many hours had been logged working on their problem, even if a solution hadn't yet been found.
A personal note: as a "worker bee" myself, I feel that this would help me be more vigilant about documenting my time spent working on a case. As it is, I feel that the "time spent working on" and timesheet feature only provides value to the managers that are assigning cases, setting estimates, and setting up timelines and milestones. Because I find no personal value in the recording of this history, I feel it to be a "hassle". However, If my recorded work were reflected directly on the case's history, my efforts recording my work would be more tangible to me, as well as to anyone that comes to review the history of that case. One of my primary goals as a worker of cases is to be thorough in my history updates... I feel that making my timesheet information visible on it's associated case would directly lend to a more thorough history for that case, which would provide direct value to me as a worker.