When Linksys released their Linux-based broadband routers, e.g., WRT54 series, the Linux community quickly released custom firmware to add new features on the router. I personally am one of those who "hacked" a WRT54G router and added more features.
Although several years late, Netgear officially releases their Open Source Wireless-G Router, the WGR614L. In addition to the product, Netgear also opened a site where users can share their experiences with this new router.
If only this router supports IEEE 802.11n OR has two WAN ports, I'd get it in a jiffy.