Hi Don,
I've been working on NetTalk 5 for some time now Don. A lot of the original stuff has actually made it into NetTalk 4 along the way.
One key feature is the introduction of the (optional) ability to make your NetTalk app a DLL instead of an EXE. Then the DLL can be "used" by a "host" server. This allows one server to handle multiple DLL's (multiple "sites") but at the same time use only one IP/Port combination.
We're also looking at supporting PHP pages from inside NetTalk - that project is well under way, but not yet completed. In essence this would allow you to mix PHP code with NetWebServer code, and also allow you to host PHP sites with the NetTalk server. It's a work in progress though, and there are, as you might expect, some technical hurdles to overcome.
There are a bunch of other features, scripts, optimizations and so on that will be in as well, although probably not in the first release. I'd like to keep the jumps from one release to another as small as possible so that upgrading is no big deal.
Cheers
Bruce