Laura Gibb's page of Latin carols, newly edited for 2010 is now on-line. The site gives the lyrics of two or three carols for each day of December, including both carols like `Adeste Fideles' which were originally written in Latin and translations of carols in other languages. There are also links in many cases to performances available on Youtube. Although Gaudium Mundo does give the complete words for `Adeste Fideles', no video has yet been uploaded. Andrea Bocelli's performance is nevertheless available on Youtube and the two verses he actually sings can be read , with literal translation, on this page. Text and translation are similarly available here for a female choir singing `Veni, Veni Emmanuel'. Gaudium Mundo has a link to a different performance. There also words for the Advent hymn Gaudete which can be heard on Youtube performed by Steeleye Span by the Oxford Camerata, by Libera with a childrenboys' choir and also (via the Wikipedia page for the song) by the dwsChorale.