Occansionally, a developer needs additional information before he can began working a ticket. Our process is to add the question as a comment, assign it to the relevant stakeholder and move the ticket back into the Open status. Sometimes, the stakeholders do not respond so the ticket just sits in the queue. I need to find those tickets so that I can followup with the stakeholder.
I used to use the Greenhopper's age indicator for this. Greenhopper used to reset the age indicator along the bottom of the ticket whenever the ticket changed columns (i.e., status changed). It no longer does this and shows the total time a ticket has been in that column no matter how many status changes occurred.