Consider analysing large files etc that are using most of your bandwidth. Assuming you have direct access to the log files, you can see which files are responsible for most of the bandwidth and consider reducing them.

DO some or all of:

- Better optimise large images
- Have fewer images
- Optimise your HTML better (especially if you have large pages)
- Install compression to reduce HTML bandwidth usage (warning: this can increase cpu usage)

Etc, as required by your log files.

If there are any third party sites which are linking your images which generates traffic, contact the authors of those sites and ask them to copy the images (unless they are prohibited from using them, in which case ask them to stop). Threaten to replace the images with something unsavoury with no notice

Mark