I highly recommend reading the ACM's Risks Digest (you can read it in rdf format at http://catless.ncl.ac.uk/rdigest.rdf, or via email — instructions are at http://www.csl.sri.com/users/risko/risksinfo.html) or adding its RSS feed at http://catless.ncl.ac.uk/risksatom.xml to your feed browser.
Reference to the Tanenbaum-Torvalds discussion of micro versus macro: Open Sources: Voices from the Open Source Revolution; Appendix A, The Tanenbaum-Torvalds Debate