Title: Tcl for Web Nerds
Primary Web site: http://philip.greenspun.com/tcl/
Description: an online book by the authors to provide basic Tcl information for someone using Tcl as a web programming language.
[Backup site: http://www.viaro.net/users/bradinvancouver/index.html is slow, but captured this book, plus a couple of other writings, from the original site, in PDF form rather than keeping them as html.] P [also http://philip.greenspun.com/books/]
RS: Worth reading in the introduction: the section LISP without a brain (but with syntax on steroids), which talks bad about Tcl, but on the other hand praises its success as compared to Lisp.