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I found some videos of people doing it here: http://www.youtube.com/watch?v=uqfWbgStfjY http://www.youtube.com/watch?v=7Opze-JzII8&feature=related http://www.youtube.com/watch?v=XqutyYVbCs0&feature=related
As to how to do it (from the guides): The Dash Slash - The dash slash is preformed with a quick tap in the direction you want to slash, and then press the square button almost immediately after. It is easiest to do with the D-pad, tap a direction, wait a split second (not immediately) and then tap the square button. This is the dash slash.
The Dash Jump - Everybody's favourite move they love to hate. First you must master the dash slash technique, if you do that it really isn't that hard to get this. Rather than pressing the square button to do the dash slash, press the square button and then the jump button right afterward, press the two buttons so instantaneously that you are almost hitting them at the same time, but you MUST hit the square button first. A very large jump follows.
"Dash Jump" - I'll summarize what Justus told me about this.Basically, you do the dash-attack, and right after you press the attack key to execute the dash, hold the directional key and press jump in a nice "mid-tempo waltz" or "um, bah bah bah" rhythm, or "D-key, Attack D-key Jump".