I picked up an old copy of Nature today (October 2007 issue) to read in the library...and guess what I found?
An "Insight" supplement on host-microbe interactions!
What's more, you can read it free online here: http://www.nature.com/nature/supplements/insights/hostmicrobe/index.html
For more features, visit the Insights archive on the Nature website: http://www.nature.com/nature/supplements/insights/. All are free to access for 6 months from the date of publication.