I'm looking for actual, legitimate research on the usability of opening
links in new windows. I've found several articles based entirely on
assumptions ("users are likely to...", "some users may..."), but nothing
from an actual usability study performed in the past couple of years since
tabbed browsing has become prevalent in the major browsers.
I know the answer is "it depends", because there are certainly going to be
exceptions to whatever the general best practice may be, but any actual data
from usability research would be better than the articles I've found.