Just a teaser for now. This is a plugin we're writing to test the internals of the plugin system and make sure it's working like it's supposed to. So for now, this plugin isn't available. But it will be soon; most likely shortly after beta 9 is released.
The Sales Chart plugin adds a menu to your dashboard that lets you view a line chart of your sales for the current week, month, and year; the previous week, month, and year; and all time. This gives you a quick glance into how well your sales are doing.
Since words don't really work to explain it though, here are a couple of screen shots.
The dashboard with this plugin enabled