From the Treasury of Latin Prayers site on the Te Deum, the hymn after which this blog get's it's name.
Te Deum, also sometimes called the Ambrosian Hymn because if its association with St. Ambrose, is a traditional hymn of joy and thanksgiving. First attributed to Sts. Ambrose, Augustine, or Hilary, it is now accredited to Nicetas, Bishop of Remesiana (4th century). It is used at the conclusion of the Office of the Readings for the Liturgy of the Hours on Sundays outside Lent, daily during the Octaves of Christmas and Easter, and on Solemnities and Feast Days. The petitions at the end were added at a later time and are optional. A partial indulgence is granted to the faithful who recite it in thanksgiving and a plenary indulgence is granted if the hymn is recited publicly on the last day of the year.
Te Deum laudamus: te Dominum confitemur.
Te aeternum Patrem omnis terra veneratur.
Tibi omnes Angeli; tibi caeli et universae Potestates;
Tibi Cherubim et Seraphim incessabili voce proclamant:
Sanctus, Sanctus, Sanctus, Dominus Deus Sabaoth.
Pleni sunt caeli et terra maiestatis gloriae tuae.
Te gloriosus Apostolorum chorus,
Te Prophetarum laudabilis numerus,
Te Martyrum candidatus laudat exercitus.
Te per orbem terrarum sancta confitetur Ecclesia,
Patrem immensae maiestatis:
Venerandum tuum verum et unicum Filium;
Sanctum quoque Paraclitum Spiritum.
Tu Rex gloriae, Christe.
Tu Patris sempiternus es Filius.
Tu ad liberandum suscepturus hominem, non horruisti Virginis uterum.
Tu, devicto mortis aculeo, aperuisti credentibus regna caelorum.
Tu ad dexteram Dei sedes, in gloria Patris.
Iudex crederis esse venturus.
Te ergo quaesumus, tuis famulis subveni: quos pretioso sanguine redemisti.
Aeterna fac cum sanctis tuis in gloria numerari.
V. Salvum fac populum tuum, Domine, et benedic hereditati tuae.
R. Et rege eos, et extolle illos usque in aeternum.
V. Per singulos dies benedicimus te.
R. Et laudamus nomen tuum in saeculum, et in saeculum saeculi.
V. Dignare, Domine, die isto sine peccato nos custodire.
R. Miserere nostri, Domine, miserere nostri.
V. Fiat misericordia tua, Domine, super nos, quemadmodum speravimus in te.
R. In te, Domine, speravi: non confundar in aeternum.
O God, we praise Thee, and acknowledge Thee to be the supreme Lord.
Everlasting Father, all the earth worships Thee.
All the Angels, the heavens and all angelic powers,
All the Cherubim and Seraphim, continuously cry to Thee:
Holy, Holy, Holy, Lord God of Hosts!
Heaven and earth are full of the Majesty of Thy glory.
The glorious choir of the Apostles,
The wonderful company of Prophets,
The white-robed army of Martyrs, praise Thee.
Holy Church throughout the world acknowledges Thee:
The Father of infinite Majesty;
Thy adorable, true and only Son;
Also the Holy Spirit, the Comforter.
O Christ, Thou art the King of glory!
Thou art the everlasting Son of the Father.
When Thou tookest it upon Thyself to deliver man,
Thou didst not disdain the Virgin's womb.
Having overcome the sting of death, Thou opened the Kingdom of Heaven to all
Thou sitest at the right hand of God in the glory of the Father.
We believe that Thou willst come to be our Judge.
We, therefore, beg Thee to help Thy servants whom Thou hast redeemed with Thy
Let them be numbered with Thy Saints in everlasting glory.
V. Save Thy people, O Lord, and bless Thy inheritance!
R. Govern them, and raise them up forever.
V. Every day we thank Thee.
R. And we praise Thy Name forever, yes, forever and ever.
More References on the Te Deum
EWTN's page on the Te Deum
Indepth history at the Catholic Encyclopedia online