here are some ideas (I am doing most of this myself, or am in the middle of implementing this):
* monitor all doors
* monitor all windows
* monitor garage door
* monitor mailbox
* monitor sump pit (in case it starts filling up)
* monitor for water in the laundry room (clothes pin with metal wires on each side, seperate with a piece of paper towel, if it gets wet, it will dissolve and create a contact)
* monitor dryer (magnetic reed switch on the drum)
* monitor CR magnetics current monitors (to monitor if your furnace is running, washer etc)
* doorbell
* garbage cans in the garage (if in place on garbage day, raise hell!)
I am sure I forgot something, but I am sure you have a desire for more than 4 ports now
