Asus RT-N16 Router - Some Links to Get You Started!
This
page has now been "UNDER CONSTRUCTION" for longer than I'd care to
admit. It doesn't seem as though that will change anytime soon. Sorry about that.
Given this isn't likely to change anywhere in the near future, I'd like to suggest you make use of the following links:
Google Search
Discussion on the "Best Firmware for the Asus RT-N16"
DD-WRT Wiki on How-To Install the DD-WRT Firmware on your Asus RT-N16