Requires iOS 3.2 or lower
An Android-like lockscreen where you have to draw the correct pattern to unlock.
After installing it, go to Settings > AndroidLock to set the pattern. Requires 4 or more dots to be used.
Password recovery trick:
1) Call your iPhone, answer and then tap Home while in call.
2) Now you are at home screen.
3) Use cydia to uninstall and reinstall the app.
OR for advanced users, remove the android lock plist out of /var/mobile/Library/Preferences folder.