[solved for me] what's been emerged from this overlay?

[kEiNsTeiN]

I want to delete an outdated overlay via layman, but dont know which ebuilds I have to copy out before doing so (because I DO use some of them). how can I accomplish that?

equery list gives me a list, but without the source of the ebuild..

edit: I did it with
eix >> eix
grep Installed eix | grep "\[?\]"
grep Installed eix | grep "\[2\]"
(becuase my that overlay had number "2" in eix)
then going through eix (the textfile) with an editor, searching for that specific times and watching out for the damned zugaina overlay...
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make me a sandwich. - what? make it yourself. - sudo make me a sandwich. - okay.

[frostschutz]

'eix -I -O' lists all installed packages that came from an overlay directly, no need for grep.

of course if you use 100 different overlays it won't be nearly as easy to tell what is what.