But now, Blogger has got a new option to make this frequent operation much simpler...<base target="_blank"></base>
From the Post editor, just click on Link
New Blogger Feature: Open Link in a New Window
Until recently, the easiest way to have all links in a post to open in a new window, was to insert the following HTML code as the first line of the page:
From the Post editor, just click on Link
...and click on the box next to "Open this link in a new window"
It's not clear since when this has been implemented as I found no official announcement for this. Just ran into this option today.
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From the Post editor, just click on Link