The Trek Core site and it's amazing collection of screen captures has been a amazing reference.
One frustration however has been the incomplete TNG HD captures. Does anybody here know why that collection of images is incomplete? As of right now, the HD captures only go up to the beginning of Season 6.
Having dug deeply through the archives there it seems that the captures are done by human hands and isn't just a "take a capture every 20 seconds" scenario.
They will make sure to make more captures during a good explosion or when a bunch of pages of text are flashing by on a computer screen.
Did I mention that I love frozen pyrotechnic explosions? So weird and funny.