Here is a copy/paste of a review I posted at XDA in response to someone who asked for comments on Seek Droid....
"I can gave you a brief snapshot [after finishing my write up I realized it wasn't so brief]. Note: I haven't lost my phone yet so I've only been able to test it. Also, I have not tested other Droid locator apps so I have no point of reference. I've tested this on a Droid X.
Setup is a breeze. The user is asked to enter a username and secret code. The app goes through a registration process. The main screen of the app (on the phone) is organized as follows: View Website; Your SeekDroid.com Login; View Help; Current Status [Registered]; Your Secret Code; Options for Enabling remote formmating of the phone and SD card; Option for retrieving call history settings; Terms of Service; and Contact Us.
At the Seek Droid website, you're asked to enter your username and secret code. A top line menu appears, as follows: Locate; Alarm; Calls; Hide; Lock; Wipe; Help; and Log Out. Locate does just what it suggests: the webpage sends out a search command and a Google map displays the location. The Alarm options prompts you to type a message to be sent to the phone. Once the message arrives, the message pops up on the phone's screen and it beeps and will continue to beep until the screen is touched. When the screen is touched, you're taken to the slide-to-unlock screen. If your phone is secured with a password, you'll be directed to the unlock screen (pattern or keypad). Calls displays a recent call list. Hide triggers your device to hide the Seek Droid app from you list of apps (in your app drawer). Reboot is required. With Lock, you're prompted to assign a new digit lock code (digits only, not a new pattern lock). Whether your device already has a lock code or pattern lock, the new code is applied. I, for example, have a pattern lock. I changed the lock code remotely with Seek Droid and it changed it to the new code I sent. With Wipe you are given a prompt to ensure that's what you want to do. I did not test this feature. I might backup my SD card and try the wipe feature for that...I'll report the results later if I do.
I've tested the app indoors and outside, with GPS on and off. It finds it every time, usually within 3 minutes. I keep Use Wireless Networks and Enable Assisted GPS activated in the Settings screen on my device. Also, I have an app protector app that locks apps on my phone (along the lines of App Protector). I have Settings locked (requires a password to access). Seek Droid is able to change the unlock code remotely with Settings protected and unprotected.
Naturally, Seek Droid does not find my phone when it's turned off or in flight mode. Seek Droid does not provide advanced user controls like deleting individual apps, turning off/on GPS, remotely turning on your phone, etc.
Locating my phone worked with Internet Explorer, Firefox and Chrome. Javascript must be enabled.
One final comment: I encountered an issue with one of my computers locating my phone. I contacted Seek Droid support and received a response within 1 hour. Very helpful and responsive...kudos to them. After some troubleshooting, I discovered the problem rested with my computer. Seek Droid worked well from every other computers I have access to (rather than troubleshoot the problem with the one computer, I simply won't use that one to log in to Seek Droid in an emergency). So, my advice is to test the app from various computers so you know which one to use if and when you actually lose your phone.
I recommend the app based on my limited testing. I also recommend that you use this in conjunction with a device password or pattern lock (or an app protector app to prevent removal of Seek Droid). You simply want to set up controls so another person can't easily uninstall the app or deregister the device."