yea some good info on there. keef is its own world. although nothing touches scissor hash. keef isnt as popular because not everyone has the means to collect it.
there are grinders that have a keef screen. and what it is, is as you grind your bud the powdery mixture (mostly crystals) gathered by that constant grinding falls through that screen into a second layer of the grinder. after some time has gone by and some bags ground up, you can open that part of the grinder and gather a cool couple bowls of pure light green powder. this is keef.
you can get it at the clubs here in california. although it is somewhat pricy for only half a gram. but it is pure heaven when you take that puff. such sweet green taste. its like taking the greens on a bowl only times 10. and it definetely gets you a kind high going.
the best keef comes from the grinder. other ways of making it are with sets of screens where you take your excess dried foliage, break it up a little bit, not much. and lightly slide hand fulls across a screen getting as little green as possible always.
then that handfull made, put onto a smaller screen and so on. leaving you with some crude, lower quality keef- but still a good way to use every part of the plant. i would much rather some crude keef than a bowl of dried leaves
look online for some grinders with keef screens though- there not to pricy, and worth it when your running low on smoke and you know you have a farelly potent treasure building up
peace