Here are some security apps that do not only involve putting a lock on.
Lookout Security & Antivirus
This app allows you to block malware, spyware and trojans. You can scan weekly for possible viruses as well. Also, not only do this app protect you from viruses but you can set an alarm to your phone if you are afraid you will loose it. Go to myLookout.com for more information.
McAfee WaveSecure (Trial)
McAfee with remotely lock your device from the web or via SMS from another device and will back up your data in case something happens to your phone. It also allows you to access your data online from anywhere.
Security Guarder is a firewall that helps you filter unwanted text messages and unsolicited call based on your own rules. It provides 7 scenarios and you can customize the default rules according to your own business.