What I had to do to install this on my Droid 2:
In Settings -> Applications enabled "Unknown sources"
In Settings -> Development disable USB Debugging so that I can see the SD memory card contents when plugged into my computer. (I have to turn that on to use the PDANet tethering software).
Right-click on the .zip and Save-As to download it to my PC
Extract the .apk file from the .zip
Connect the phone to my computer via USB
Copy the .apk file to the download directory on the phone
Disconnect the phone from the computer
In the Files app select Phone files, then download, then "Open Shot Timer.apk"
Finish the install
Enjoy!
Ariel and MichaelG...thank you!
Michael...can you PM me a paypal address so I can send you the $25 to register the app?