Traffic Website

That seems to be a rather dated reference in the T2005 manual in a section that deals with the use of AFCAD for customizing airports.  AFCAD and some other fantastic tools (e.g. TTools) were the work of an FS luminary, Lee Swordy.  After brightening our little world with some absolutely amazing things, he has taken himself completely out of the FS world.  I suspect the site referenced was his and he's probably taken it down.  That's speculative on my part, but it fits what I do know.

AFCAD itself, while not to denigrate it for the great work that it was, has largely been supplanted by two other products that do more, do it better and also do it for FSX as well as FS9.  The freeware one is ADE9X from Scruffy Duck software.  There's also a payware one from another publishing house that I won't mention here in the JF forums, which seems to be a direct upgrade of AFCAD, with nearly identical screens and interface, but with added capabilities, including the ability to use with FSX.

If you're looking for downloadable AFCAD files (i.e. replacement airports for FS) go to AVSIM, Flightsim.com or any one of a dozen other popular FS sites with download libraries.  Most will have a subsection for "Airports", "AFCADS", "Airport Scenery" or whatever and you'll find more than you could possibly ever use.

If it's airplanes (and/or repaints) you want, there is nothing special required for them to be used as traffic in T2005.

Go to the download sites and have a ball with freeware aircraft.  You can use any AC properly installed in flight sim as traffic in T2005 - freeware, payware, AI or flyable, helicopter or fixed-wing.  Just add the appropriate lines to one of the flight plan files, or create a new flight plan file and you can put any AC at any airport at any time. 

You have to use the T2005 compiler to add the new AC to the list and to do a recompile of the traffic after adding or editing flight plan files to get it all to show up but it's not difficult.