The progress in the Commmuion Psalm Project has stirred a great deal of interest in sources for chant online.
The single best source for nearly all chants is a site that has been up since 1994. The images are clean, clear, straight, good resolution--all from the Liber Usualis but arranged according to the new calendar
These should be bookmarked:
They can be copied and pasted into any word processing program, the translations added, and then used for Sunday programs and the like.
Note: the recordings are not great. The images are the payoff here.