TED talks/videos can be a great source of free classroom or individual student enrichment. Naturally, use with caution. TED materials are typically most appropriate for upper grade levels, but expecially visual presentations could be repurposed for the lower grade levels.
Laura Schwertfeger shared - lots of nice Christian photos, videos, etc. There are many available for free, others for purchase. Even the ones you have to buy do seem much more affordable than some of the istockphotos I have looked at lately.
Great music available for free under the Creative Commons license. Good for video productions, etc. There are all different genres available for whatever mood you wish to strike. Many classic pieces that would be suitable as a background pre-service or pre-function filler. Curated by WFMU radio station.
All in one collaboration center. Group email, text, voice, meetings, conference calls, chat rooms, calendars, files, polls, and project management. Best of all, FREE!