Gmail tips
Some useful stuff I've just found out:
This is only if you have a Gmail account.
To order labels how u want, rename them with 1 or more spaces in front of the name. As spaces come first alphabetically, the ones with the most spaces will be at the top. Spaces also take up no space.
You can create filters to see how much spam you have (make a filter with "is:spam" in the "has the words:" box.
You can also see how much unread stuff you have in total - make a filter "is:unread" in the same box.
I also use labels with names like "------------" to split up the label view.