C# command line FTP server

I've been working on a command line driven managed FTP server for the past few weekends. Something fun I've been doing on my off-time. Feel free to check it out: http://www.gotdotnet.com/Community/UserSamples/Details.aspx?SampleGuid=0a7606f3-f8ec-4e39-8d0e-517248b7164c. It only supports a subset of the FTP RFC, but hey, one could extend it and post the result here right? =)