Restore broken Android market links
Just a quick tip here if you use an app backup utility like Mybackup Pro or Titanium backup on a rooted device.
Sometimes its possible, even on a rooted handset to restore your apps and data and find that the market does not show the apps as being installed.
To fix this goto settings from the home screen on your device by clicking options/settings/applications/manage, then navigate to the Android Market and clear both cache and data. Job done!