Forum Moderators: open
Teoma is much more technically oriented and they do have a site: switch. But you need to use at least one word in the search as well, not just a minus sign or a bare site:example.com
<correction>
AskJeeves works the same as teoma -- you need at least one word. So for instance, this search get results:
recent site:webmasterworld.com
but not this:
site:webmasterworld.com