looking for info on search engines?

How can you find out how many searches are done for keywords in the different search engines?
Example, tygo.com has flat rate placement. You pay one monthly payment. Instead of the cost per click. It all sounds good but they don't seem to have to many advertiser. So I was wondering if this is worth tring or not.

I would be concerned as to how many people got to the site. At first wondered if it would be worth it to just have another backlink if it was cheap enough, but the internal pages dont have any PR.

I personally wouldn't spend my money on it. I seriously doubt many people use it for a search engine.

Google doesn't have any internal page rank either, from what I see.

It must be a new site.