file owner nobody:nogroup

I have similar problem with the /files/css/_somefilename.css files
and the owner of the file is apache itself and I can't delete them

I am sure sending a ticket request to your host can solve your problem
but I was wondering if there is anyway that drupal can assign the
"correct" owner on such file

This is a duplicate of http://drupal.org/node/225880 which attempts to deal with the underlying issue. Please head over there and try the patch (on a new install, it won't fix the issue on old installs).

Sorry catch but I don't think this patch deals with our issue

our problem is with the /public_html/file/css/ directory
which is automatically created from
admin/settings/performance setting to bundle all CSS files together

I did not apply the patch but by looking into it I did not see anything for
that folder, or was I mistaken ??

Hmm, well it's the same overall problem with drupal creating directories but you're right that issue is targeted at settings.php only (which is a more serious issue anyway). I can't think of many options other than expanding that approach to include other directories though.

Should we bring this to the attention of the other thread ??
These files and folders are created as part of the core (after all)
and I think they are heavily used ....

http://drupal.org/node/172250 is also related.

Looks like there's more effort for the same at http://drupal.org/node/172250