Sometimes the OS X software firewall gets stuck in a loop and will continuously prompt to allow network access for an application.
49034307.jpg
I've seen this happen a couple of times with iTunes. Though it can happen with any application. A common cause is changing icons of system ...
Disable Guest Accounts for Shares on OSX Tiger
sudo defaults write /Library/Preferences/com.apple.AppleFileServer guestAccess -bool false
Disable Dashboard
defaults write com.apple.dashboard mcx-disabled -boolean YES
Reduce Safari Rendering delay
defaults write com.apple.Safari WebKitInitialTimedLayoutDelay 0.25
Increase animation speed of sheets
defaults write NSGlobalDomain NSWindowResizeTime ...