http://kzay.com/

The results are quite fast

Great tool. Although quite difficult to understand as it is a bit naked without a lot of explication. If I compare msn/yahoo, I notice that msn is a lot faster than yahoo, but the results are irrelevant at msn's and much more relevant at yahoo's. (Google was fast and relevant ;-)).

The real value of this tool is for SEOs who want to compare their site's Rankings ACROSS Datacenters for Keywords

compare it to THIS famous tool:
http://www.mcdar.net/Q-Check/datatool.asp

Also do a search for the term SEARCH ENGINE OPTIMIZATION

You will see that virtually NO-ONE, no matter how skilled, is immune to fluctuations and disappearences in Datacenters