A magazine that IIRC sometimes had articles about Tcl. It has unfortunately ceased publication. AH: Actually, reports of their demise are greatly exaggerated - see http://www.cuj.com/ . A quick search for "tcl" in their archives yield 34 hits, although of course only a few of those are actually useful.
Dr. Dobbs Journal seems to do more articles about Tcl and they support the Tcl-URL! - RS: Yes, that they do, and offer the latest issues for purchase! But searching their site http://ddj.com for "Tcl" brings only one article from 1999, plus various Tcl-URLs.