I have just completed and written up a little research project of mine:
http://www.gwern.net/In%20Defense%20Of%20Inclusionism#the-editing-community…
Summary:
1. Talk pages are where references/links/citations go to die; less
than 10% ever make it back
2. In just the sampled edits, millions of page-views are affected
3. Conclusion: putting references/links/citations in an Article's Talk
page is a bad idea (compared to External Links)
Numbers, source code, and lists of edits are provided in the link.
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gwern
http://www.gwern.net