Get a wireless network camera with motion sensor recording and ability to see in dark. new cameras therse days can record on motion to ftp or email with screen shot. Linksys does it but no ability to see in dark.

X10 is not a good solution as anyone can hack into your cameras.

Here is a store to see all at one place. Don't have to buy from them. Sony SNC-RZ30 is very good but expensive. Sony, Panasonic, Toshiba, Axis and Canon are all good companies for security cameras.

Panasonic

Toshiba