I completed version 1.0 of the Post-Reminder module last night. This version clears up the three major issues I had with the 0.7 version released previously. Users can now see a list of all their reminders from their account page, the Amount of Time field is validated as an integer on reminder creation/editing, and an error is displayed on the reminder creation form if the site administrator has not set any content types as permitting reminders.
I've begun working on a module I'm considering for my capstone project as Capella. What I'm thinking of is a module which will allow users with content creation privileges to set up reminders which will be sent to them if they haven't posted new content to the site in some configurable length of time. Basically, a way to set up a custom nag if you don't post.