Should Links Open In New Windows?

I think that the vast majority of content (not search-engine) sites have come to adopt the "new window external link" methodology and that is, in fact, what people expect. I'm never angry at a site if I click on a link and a new tab pops up. If I accidentally forget to open a link in a new window though, I AM angry because it has destroyed my state and there's no way to just get it back (the back button is not always perfect).