I know that theres nothing big under sw, but this is a new way and is good for practicing wall jumping.
go here
then wall jump up (wall jumping is done by angling yourself at a slanted wall and pressing W and jump at the same time, but it usually only works on a slanted wall [however it can be steep])
(video for angles that do and dont work for wall jumping (as well as how it looks) can be found here http://www.youtube.com/watch?v=kX6k95KwpfA)
carefully walk around the corner and go down to the next ledge
corner jump up here (corner jumping is jumping into a place where 2 walls meet, press W & jump just like in wall jumping)
follow the arrows and jump into that little gap in the walls
congrats, id say do it once a day till you get the hang of wall jumping and youll be set for exploring.