How do I use bitcoind through Terminal on Mac OSX? I think this is not adressed by these questions, but honestly, I'm not sure:
Per Gavin Andresen's answer on the first post to which you linked, Bitcoin-Qt for Mac does not ship with bitcoind. However, you can still access it with
wget, or using the provided Python wrapper. See the post for more.
If you are adamant about using
bitcoind itself, your best bet is to compile your own
bitcoind using my instructions or using the instructions provided in the source distribution of bitcoin.