So... Posting this for posterity...
If you are "just" looking for a copy of tcltls, binaries can be found in the latest BAWT installation at the above URL. However, this does not contain a complete package. You will have to manually download and copy tls.tcl from
core.tcl.tk (or anywhere else really) into the same directory as the one holding the DLLs. Paul, are you reading this?
Also, if you want to use these from within a starkit (or similar), this won't be enough since the main DLL, while statically compiled with a version of OpenSSL, still requires another DLL to be present (presumably in the same directory) and called libssp-0.dll.
As this is a recurrent problem with starpacks, I've written a package for automatically copying DLLs out of starkits and onto the local filesystem, together with their "siblings", i.e. libraries that would exist within the same main directory as the original library path passed to the load command. This mechanim bypasses the internal Tcl mechanism, which recognises that the library is contained within a VFS and copies it to a TCLXXXXX directory in some temporary location on your drive. The advantage of my package, apart from solving dependencies, is that it will keep the copies for "posterity", allowing for quicker starts of a packed script.
The package is at:
http://wiki.tcl.tk/49292