RBuzz - 5:45 pm on Mar 3, 2003 (gmt 0) Mfagan,
Upon trying a few queries, it does seem to work. The typical (word1 ¦ word2) (word3 ¦ word4) at least appears to work perfectly. How long has this been around for?
I've been using parens regularly on Google since last summer. I don't know when they started working -- I've never had problems with them. Mind you, I don't do that much nested stuff -- like (foo (otherfoo ¦ bar)) -- but generally just enough to keep my queries neat.