Be a Considerate Surfer
Remember that free to use doesn't mean free to abuse.
Some of the larger nodes may cover several blocks and be used by many other people. Be considerate and don't choose a free node to share your bootleg music collection via Kazaa or to download that latest Linux CD-ROM image.
If you're in a residence and are a heavy user, consider getting your own broadband connection - and then legally sharing it with your neighbors. We'll help you. Then everyone wins.
So Cal Free Net.org