Years ago, I made a little webpage for the O Antiphons. It might be useful.
Also, on this blog
17 December – O Sapientia
18 December – O Adonai
19 December – O Radix Iesse
20 December – O Clavis David
21 December – O Oriens
22 December – O Rex Gentium
23 December – O Emmanuel
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WRT O-Antiphons,
I just bought the Latin/English book, Lauds and Vespers, edited by Rev. Peter Stravinskas. In Christmastime, the O Antiphons are used just as you typed them out above. Just posting to put in a plug for this version of the Liturgy of the Hours. I don’t profit from it, I just like the prayerbook.
There are some lovely versions of the O Antiphons that I follow at Youtube, done by the brothers at Oxford. They start here:
http://www.youtube.com/watch?v=S6zaiZxJIpU
These explanations of the meaning of the O antihons is most helpful but in the summary with the anthems listed on the side “O clavis David” seems to be mixed up with “O Radix Jesse.”
The Premonstratensian Rite has an extra ‘O’ antiphon; O Virgo Virginem’
See;
http://norbertinevocations.wordpress.com/2008/12/21/the-o-antiphons/
for more details.