From Capp Plus:
App Protector Pro for Android allows you to lock any application on your phone like SMS, message, Gmail, photo, gallery, and market. You can choose to only lock sensitive apps, while leave other apps unlocked. Lock with either password or pattern. It provides automatic locking mode and manual locking mode. It includes locale plug-in and tasker plug-in. There is a widget for quick locking/unlocking.
What's new in this version:
Version 1.9 includes new password recovery method, device admin capability, and bug fix.