UX HELP - Has the new tab vs same window question been answered?

Guys, when you have links on your site and tools, do you open in a new tab OR same window?

e.g. Do you open internal links in the same window but open external links in a new tab? or do you keep everything in the same tab?

Here is my example: http://www.planforcloud.com/pages/recruitment.html Would you open the 'RightScale' link at the top in a new window? Look further down, there are more links - would you open all these in the same tab?

Cheers, Hassan