Either you can go for RSS Feed or build a smile webpart that iterates
items from list(s). I think you might even think of googling it out for
such web  part in handy....

The Content Query web  part will work for sites in the same site
collection and can be extended to list  most any file you like by
customizing the xslt. A Data View web part  can also be used and can
access any site  via the web service interfaces.

But can you in these webparts  use a toolbar and a dropdownmenu on
each item as you can in the listviewwebpart? Because thats what I
want. I want a webpart that works excactly as the listviewwebpart  but
with the possibility to show its content  from another site.

No, they cannot (at least not  OOTB) and to the best of my knowledge no
such web  part currently exists. If you have a lot of XML/XSLT/CSS
expertise, you might be able to take an existing list  view, convert it
to a Data View in SharePoint Designer, then much with the XSL and data
sources to get what you want. I've not tried it personally, so I don't
know how feasible that approach is and how close you'll be able to get
to what you want.