What Is The Ideal Number Of Links In A Blog Post?

In episode 124 of our weekly Hump Day Hangouts, one viewer asked how many links in a blog post would be considered excessive.
The exact question was:
Basic 101 Question: How many links is too many links in a blog post? Client with multiple keywords he wants to rank for – 40-50 or more. A good brezzy blog post can easily inlcude 5-6 or more keywords that matter to him without being stuffed or forced. Can we link each keyword phrase, just one plus a domain url, or go overboard and link more? (Averaging just 1 post a week or less, and do not want to increase that velocity)
And since we have so many keywords, should we also make them tags, whether ot nor we link them?
