Article 113656 of comp.os.vms:
eTeX, an extended TeX, is now available from

http://www.rhbnc.ac.uk/e-TeX/

It is backwards compatible to TeX, but contains several extensions.

An example of the use of eTeX can be found on my page

http://vzdmzi.zdv.uni-mainz.de/~knappen/jk006.html

which demonstrates the usefullness of the new middle primitive.

--J"org Knappen.