Every1 know what it is and some can do this really good. I found the video showing the amazing skill on YouTube 3 days ago:
http://www.youtube.com/watch?v=_YRiBxJWLy8

If you're as shocked as I was then look at this response:
http://www.youtube.com/watch?v=Ep4jQa4Ewic

Easy, heh?

This one isn't as fascinating as prevoius ones but it shows something interesting:
http://www.youtube.com/watch?v=qHfT9AgBMzQ

You can download xcm_tricks2 map from there: http://dl.evilarena.de/pk3/baseoa/XCM_Tricks2.pk3 or just \callvote map xcm_tricks2 on Evil|Arena.

Have a nice practice!

EDIT: (panic)
Other download link now - on your link I got an error

Wow really nice jumps o.O

Weapon show me his strafe jump today...
3 month dont (really) play and the first run on xcm_tricks2...... 2400 u/s 

PS: i got a error on your Dl-link like 'wrong refferer'

PS: i got a error on your Dl-link like 'wrong refferer'

Then try: http://h3km3k.ath.cx/~jumpmaps/index.php?lang=de

Some strafe jumping on the jjm2 map this map is available here http://q3a.ath.cx/?lang=nl&mapdetails=jjm2-df

http://clanarena.org/arena/videos/id_212/

Most popular (training)tricks video EVER!! quake the firat map you see is called q3dm6 is played in dm/tdm and tourney alot,..also available for oa ofcourse enjoy the video http://clanarena.org/arena/videos/id_86/

awsomeness seen here strafespeed like you never seen before http://clanarena.org/arena/videos/id_28/ enjoy

http://video.google.co.uk/videoplay?docid=1901804967434875524
control is better than speed me thinks xD

http://www.youtube.com/watch?v=5nKcBl2WVR8&feature=channel

example of how to lose speed to get to the end xD

If you're as shocked as I was then look at this response:
http://www.youtube.com/watch?v=Ep4jQa4Ewic

Easy, heh?

g_speed was 400 +

So you dont even need to do a circle jump :/ He didnt deny it, but still a great aw player

http://www.youtube.com/watch?v=5nKcBl2WVR8&feature=channel

But the music is good