These links were selected from the results of a Google search using the keyword phrase "how to let go":

1. From enotalone.com: How to let go of guilt and learn to forgive
2. From cancersurvivors.org: Letting Go (Note: This article pertains to all kinds of letting go.)
3. How to Let Go of Your Mad Baggage, a book by Lynne Namka, Ed.D.
4. On 43things.com: How to Let Go. (Note: This page has additional links as you scroll down to the bottom of the posts that also relate to letting go. I didn't go and read them all but there looks to be a lot of good input on the topic of learning to let go.)
5. On oandp.com: Delegating Effectively: How to Let Go and Why by Jodi Mills (Note: The "letting go" being discussed in this article is not the same kind of letting go as in a relationship. But the issues of perfectionism and letting go of control of others and things are important ones that can be extrapolated to cover more than one kind of situation.)
6. On Chet Day's Health & Beyond: How to Let Go of the Need to Be Right by Debbie Mandel
7. From techrepublic.com: How to let go the hard way. (A post on a blog about leadership and management issues.)