For the sake of correctness, you can still force new-window links to open in the same window in all browsers I've used so far: for IE drag the link on the titlebar, for Mozilla drag it onto the page's tab, for Opera drag it onto the window button.

That said, it is much easier for the user to let them pick that they want the link in a new window, rather than force them to use the above workaround if they don't.

Makeshifts last the longest.