aristotle - 2:34 pm on Dec 24, 2010 (gmt 0)
"on one of my more successful site launches I took on the discipline of making sure ever page linked externally at least twice. Early rankings and regularly improving rankings were the result."
I also believe this helps. I try to put at least one outgoing external link on every page I create. I try to find authority sites for this, and try to include an important keyword in the anchor text.
I think you gain more benefit by linking to authority sites, and the links are also less likely to turn into broken links later. But I usually don't link to Wikipedia, Amazon, or any site that might compete against my page in the rankings.