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It's not even really that archaic- concatenative languages just never hit mainstream among programmers. PostScript has built-in datatypes for dictionaries and lists, first-class procedures, closure-like mechanisms, clean, uniform syntax... refreshingly modern for something designed in 1982. I wrote a Forth compiler and VM in PostScript a while back: https://github.com/JohnEarnest/Four.Ps/blob/master/four.ps

Or even better:

http://tog.acm.org/resources/RTNews/html/rtnv6n2.html#art11

Copy the postscript into a file and upload to:

http://www.ps2pdf.com/convert.htm

PS is basically Forth

Fair casual observation. More here on the relationship between Forth and Postscript: http://c2.com/cgi/wiki?ForthPostscriptRelationship