This .NET 2.0 website adds additional functionality to associate a name and notes to the MAC addresses in a DD-WRT flashed router. I did this because the built in only has MAC fields which makes it cumbersome to associate names/computer to MACs when you have dozens of clients. The C# source code is included in the zip file. I make use of the open source SharpSSH library to gain access to the router over SSH.
You will have to edit several files for your particular environment.
DD-WRT MAC Address Toolkit Website