Right im gonna add some plugins. Remember you can activate whatever ones you want to use via PLUGINS menu and then activate whatever you like. I'll add a couple of lines for usage too. This list will be in a totally random order. Im trying to sort a few admin things and will just add these as i see them.
FIRESTATS
click here for demo
Activate in PLUGINS and then view in DASHBOARD. click no on the pop up. Looks like plenty of things to view. i havent looked but any questions just ask.
EDIT: 2 Widgets available in widgets (PRESENTATION>>>WIDGETS)