MSI afterburner (I have not used it, but friends recommend it) free of course
both screen and video capture works with a variety of video cards, not just MSI (your mileage may vary)
video capture and screen capture have their own tabs.
JPEG screenshot quality settings are no longer power user oriented and can be adjusted directly from the client application GUI
Screen capture implementation is now multithreaded to minimize the impact on the game performance when saving screenshots on the systems with multicore CPUs
article on ghacks.net about MSI afterburner (good read)
Basic Guide to Recording w/ MSI Afterburner (Video + PDF) tutorial on video capture
if you will do video capture, kindly research your choice of video codecs (for best performance) and please do not download those all-in-one video codec packs they might break the current video codecs you have. Download and test video codecs one by one and download only from trusted sites of course.