Tool for viewing rankings for keywords across multiple websites in one click!

[4u-domains]

Here is my problem..

I have built 50 clients for a website, all slightly different, obviously with different keywords.
Every week he is entering his top keyphrase into Google to see where each site ranks.
This takes him a significant amount of time and our build program is for 2 websites each week for 2 years so the problem will only get worse.

Therefore, my question is:

Does anybody know of a website service or tool where He/I can put all the site URLs in, along with the target keyphrase, and then at a click of a button it tells us where each site is ranking for its designated keyphrase.
I would expect the results to look something like this:

Results
-------

Site 1 | Keyphrase | Ranking position on Google
Site 2 | Keyphrase | Ranking position on Google

It would be great is the service also through up results for Bing, Yahoo, etc, but Google is his/our main focus.

Any ideas?

Thanks in advance.

 

[Shane]

I use LongTail Pro. It checks Google, Yahoo and Bing.

 

[4u-domains]

I use LongTail Pro. It checks Google, Yahoo and Bing.

Many thanks, I will check it out now.