There are more and more useful resources on the page gregor-und-taube. Mr. Anton Stingl Jr. added up to now 3 restituted chants for offertory together with proper psalm verses and with st. gallen neumatic notation above the system. Quoting from the page:
The Offertoriale restitutum is only in stage of construction. If you need other offertory verses, write me an e-mail…
Dear Mr. Stingl, we thank you completely cordially!
Motu Propriu of Benedict XVI was made public yesterday in Vatican on the rite of the mass and other celebrations prior to the reform of the Second Vatican Council. Document called “Summorum Pontificum” is in latin (Unofficial translations: english, german). Published was also letter of explanation to the bishops — this letter is available in German, English, French, Italian, Portuguese, Spanish.
What earlier generations held as sacred, remains sacred and great for us too, and it cannot be all of a sudden entirely forbidden or even considered harmful. It behooves all of us to preserve the riches which have developed in the Church’s faith and prayer, and to give them their proper place.
It will come into effect on September 14, 2007, Feast of the Exaltation of the Cross.