Unread comments and post notifier window

I am trying to figure out a way to create a popup window for users so when they login, the get a popup with all unread comments and posts since their last login. They would then have the ability to read the unread posts & comments and dismiss them.

Is there any solution (or plugin) out there like this now?

I am trying to use it with this theme:

http://templatic.com/news/gtd-%E2%80%93-private-blog-theme-for-teams-to-collaborate

Thanks in advance.