Build your own WiFi Hotspot

So if I put a Linksys WRT54G Wireless Router (or another Broadcom based router) on my balcony, it could become a source of revenue. Having a balcony next to a public beach could help a lot. All that needs to be done is a firmware replacement with one of these:
Sveasoft, or OpenWRT, or eWRT, or Wi-Fi Box. Or you can use Linspot on a Mac with any router. Wi-Fi box specifically was favorably reviewed. Just make sure reselling bandwidth does not violate your broadband provider's terms of service. Speakeasy even seems to encourage it.

This is a Slashdot Idea - not mine, but I like it =).