L is a programming language started by Larry McVoy, with extensive help from Jeffrey Hobbs, Oscar Bonilla, and Tim Daly, Jr.
Roughly speaking, it's an attempt to wrap C-like syntax around core Tcl functionality. It's described as a language "designed to peacefully coexist with Tcl rather than replace Tcl".
As of late 2006, an introductory paper is at: http://www.bitmover.com/lm/papers/l.pdf
A Wikit wiki on the L programming language is at: http://l.bitmover.com/wiki.cgi/14
(Note: On 2006-10-27 the above link was down. Maybe they moved their wiki?)
A mailing list is available. The archives are at: http://lists.bitmover.com/pipermail/l/
As of late 2006, a related IRC channel named "##l" existed on the irc.freenode.net network.
A seminar on the language was presented in 2006 at the Thirteenth Annual Tcl/Tk Conference.
PT 07-Nov-2007: I built some tclkit executables that contain L for Windows - see [L1 ]