target=_blank sounds like an interesting idea, but it depends on whether people want to leave talksearch after finding the thread they want, or if they are using this as a way to read old posts.
Whenever a site does that, I middle-click on the site's tab to close it. It's extra work, and annoying. If I want to open a new tab, I use the same middle-click to open it in a new tab. I don't need any site to decide that for me.