I blogged on “Keep In Mind” a few months ago, once the unofficial “fifth” memorial acclamation. I think you know Marty Haugen’s “We Remember” was designed as a memorial acclamation. The Gather hymnals list that refrain in their section on Mass settings. That will probably change in future editions of the hymnal, don’t you think?
Recently, I’ve encountered the refrain of “O Come All Ye Faithful” used as an acclamation. If you can’t get into the Christmas spirit, the words:
O come let us adore him, O come let us adore him, O come let us adore him: Christ the Lord.
In the modern Roman Missal, the memorial acclamation is intended to reinforce faith in the Paschal Mystery: Christ as the liberator of humanity, not just the object of adoration. Or so I thought. What do you think?
Catholic Sensibility 
Oh, yes, I’ve witnessed that substitution during Christmastide. It’s been a long while, though; and I am glad it’s been a long while.
Todd,
I know I’m just a musician, ;-p, but am I totally off base thinking that the Anamnesis texts have a sort of taxonomy?
Christ’s incarnation/passion/death
His Resurrection
The Second Coming
If so, doesn’t that mitigate the Adeste Fideles?
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