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Now they make some modificaitons on results gathered from google which was not the case earlier.
Because, I searched google for one keyword and the position of my site was different on yahoo.
Is yahoo trying to come out of the goose of google, atleast in SE arena?
Most Google partners play around with the Google algo.
just look at Aol as an example.
Other factors come into question at Yahoo, such as is the site listed in the directory?
Shak
And as Shakil stated most partners have their own piece of algo that they can use.
From what i know they can not change the way Google ranks it results but only modify certain things, i would say that the most common one is that they use Language options for filtering out results which doesn't seem to be "English"
So if your server is hosted somewhere else that in the US it may just happend that you will not show up on different Google Partners.