Does your Droid using Android OS version 2.0.1? if yes then tough luck, that recent update apparently has a bug that makes it fairly easy to bypass the phone's security-lock screen. Like most of Android based phones, the Droid security-lock mechanism are requires users to input a certain pattern using the displayed dots before they can access the phone's home screen.
The bug is actually pretty simple to exploit. If the Droid has its lock-screen activated, just simply make a phone call to the phone, and when the call came in, press the 'Back' button, and voila! it'll bypass the lock-screen and jumps straight to the homescreen. Even though you can't change or deactivate the pattern from the Settings menu, this however could be very fatal. The person who hacks the phone has every access to all vital informations such as, the owners email account, cookied web pages, phone directory and pretty much everything else stored on the phone.
Mind you though, this only affecting Android version 2.0.1 on the Droid, no words yet about the Milestone. Google already gave us a statements about this problem, and they said:
“We are aware of the issue and we’re working to deliver a fix to Motorola Droids shortly.”
So there you go, Droid users be patient and relax, Google will released an update for this problem very soon. In the mean time, you could download the
Lock 2.0 from the market, it's an alternate lock screen for your Android and it works pretty good too :)