With Apple latest OS, Leopard (Which I recommend highly), comes an interesting new feature (well, at least it is cute for a while, but it can get to you after a while). For annoying, try Vista
When you try to run an application you downloaded and get this message every time you try to start an application
"..." is an application which was downloaded from the internet...
There is an easy solution.
Check first tha it has the “com.apple.quarantine” Attribute.
xattr -l BetterZip.app
which may give you something like:
com.apple.quarantine: 0000;4726d129;Safari;5FF2A3CB-B74C-405A-BF92-AD14858A6F5A|com.apple.Safari
If it does, remove it using:
sudo xattr -d com.apple.quarantine BetterZip.app