A strange trip, exactly what is going on here?

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NOTE: You must have scripts turned off in Firefox using NoScript to see
what I am seeing)

I recently did a search on Google for:

And clicked on the 3rd link:

Which then displayed a page of nothing but keywords.
I looked at the source and found a script which would have taken me to:

http://glstn.org/gen/ftds.php?said=nch&q=injection sites
When I plug that into my browser I am magically transported to:
http://pureask.com/web/injection%20sites /

Which leads to several questions....
Is this legal, according to google search engine stuff?
What exactly is the person doing (what's the name for this)?
How effective is it?
How are they generating the page of keywords?


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