i thought it was a nice addition to accesories.. and picking the best one would be good...
remember that they are not going to run in vec's memory by default,so its up to the user to use them or not.
I personally think that such a tool is a MUST for the modern desktop computer user.
it is not a problem to include google-desktop in a distro. Yes it is not open source, but i dont think google would mind, just as opera doesnt mind. Google would welcome that, as it does support the open source comunity.
already many distributions are shipping with google applications by default.
the problem is wheter it would be a good choice from the rest.
beagle is out of the question.
google-desktop seems like a good alternative with no deps and can search internet as well
tracker seems a bit faster and lighter, but there is no gui frontend to use it with ,when you dont have gnome
strigi is for kde4, so its up for the next soho,i guess..