I don't see much mention of this, so wanted to get an idea of many people used it.

http://www.ntcore.com/4gb_patch.php
recommended by this website I reached from Google - http://preventcrashesinoblivion.page.tl/4GB-EXE-Patcher.htm

Or is there some other way to make Oblivion large address aware?

You've probably missed the thread as it's been a while since anyone has posted in it, http://www.gamesas.com/index.php?/topic/1176244-oblivion-and-memory-usage/page__st__120. 4th thread about LAA, lots had been discussed so you'll probably be interested in reading through some of it.

Yep, that's the one I use to switch on the LAA flag.

That's the one I use as well. Simple, effective, and makes a backup of the file you patch.