Quick search on google found some other places where HLA has appeared:
http://en.wikipedia.org/wiki/High_Level_Assembly (Article)
http://directory.fsf.org/All_Packages_in_Directory/hla.html (out of date software)
http://www.linuxjournal.com/article/8408 (Article, someone we all know)
http://freshmeat.net/projects/hla/ (out of date software)
http://programmerstools.org/node/311 (software)
http://context.cx/component/option,com_docman/task,doc_details/gid,209/ (woo hoo syntax highlighting)
http://aplawrence.com/Unixart/hla.html (Article)
and...
http://sourceforge.net/projects/hla-stdlib (Thanks Evenbit!!)
I'll have to check again but I think you can also find some info in wikipedia under the computer science section and in wikitext.
Oops I meant wikibook.
Doesn't matter, I can't find the one I seen earlier.
Found one or two that reference it but not the one that had a little bit more.