http://sf.net/projects/tcljava is the home for TclBlend as well as Jacl. Jacl is an alternate implementation of Tcl, this time written entirely in Java.
There is an active mailing list at the web site which provides support for Jacl.
As of September 2001, Neil Madden has what he calls a rudimentary implementation of socket.
Several Jacl-oriented stories have been published through the years, including "Extending XML tools with Jacl scripts" [L1 ].
CL occasionally updates a page [L2 ] of information related to Jacl.
Swank is an interesting extension to Jacl.