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"Tomato Firmware is a free HyperWRT-based, Linux core firmware distribution for mostly Broadcom chipset based wireless routers, most notably the older-model Linksys WRT54G (including the WRT54GL and WRT54GS), Buffalo AirStation, Asus Routers and Netgear's WNR3500L. Among other notable features lies the user interface, which makes heavy use of AJAX as well as an SVG-based graphical bandwidth monitor."
-Wikipedia

This firmware is so powerful compare to those default router firmwares. :) But the thing is, you are responsible for the risk that might happen with your router settings or the router it self. XD
you can even burn your router chipset when you go over the speed limit (by changing it, this is how cool tomato firmware is, you can even change the router speed and range)
I started using this firmware last week, at school and I was planning to set up my own wireless router using this firmware, Unfortunately I can't. Tomato firmware is not compatible with my wireless router. So I guess i have to buy new or probably second hand router which is compatible with the said firmware. It's pretty neat, you just hafto be carefull with the changes that you're going to make.

Turn your $50-$60 into a $100+ routers!

Check out their site for downloads: [You must be registered and logged in to see this link.]