This is a special bunch, not just any old 5 for Friday, but 5 for Friday times 20!
If you are into user experience this is the listing for you to explore. Some of these sites have already been "hiked" here but so many more have not. Rather than wait for the hikers to make their way, let's just share them all at once and let you go do the exploring.
Pick one to start with and have fun!