WordPress Traffic Limiter
Traffic Limiter is a useful addon for blogs with many media files which can cause high data traffic.
There are three traffic limits to avoid over traffic costs: daily, weekly and monthly limit. If one of these limits is exceeded downloads will either be redirected to a custom URL or a custom message is displayed. For images you can define a fallback icon which is displayed instead of the message. Additionally a download bandwidth can be set for registered users and guests.
Also included is a statistic system which displays the current traffic consumption and individual file stats to see which media produces the most traffic.
If the Apache extension mod_rewrite is installed download links stay the same, if not links to media files are automatically redirected. It is recommended to install mod_rewrite, although this plugin works without this extension.