Some SE and keyword questions
 

I searched on google for a 'keyword popularity checker' because im busy with a little SE project and i wanna see what keywords and keyword combos are popular of a niche or w/e.
I found this site http://www.123promotion.co.uk/ppc/

Now my question is, whats Overture and whats Wordtracker? What do those terms mean?

Since they also talk about google, i think Overture has something to do with google?

I dont know if this is a newbie thing, ive just never paid much attention to the whole SEO thing since about a week ago (when i saw the conversion ratios!).

Overture.com
WordTracker.com

Come on, was that more or less difficult than writing a post here?

as homer would say: doh!

but still,
i see overture is from yahoo. Does google also have a service like this? Or does overture show the keywords for all big SE's? On the other hand, i can imagine that the keywords of yahoo and google dont really differ in popularity.

And wordtracker is a paid service.. kind of superfluous if u ask me when i look at the link i got in my 1st post (overture & wordtracker in one)