I just fell in love with mod_macro
I knew about it, just not what it did, or way back when confused me, or something.
I just built it started giving it a test, after I figured out what the dumb error meant, it works great.
I do not like that the error would not let Apache run, that almost killed the deal.
Anyhow, I think it is worthy of inclusion at AH, and there's a Sep. 2010 version out so it's not a neglected/abandoned module. The latest only includes a Mac OSX compile fix and prettied docs page to include in ones Apache manual, but there's been a couple since the AL version, one specifically dealing with a change in Apache 2.2 vs. 2.0.