I've shared a document with you called "HTTPMR: Scalable Data Processing for People with Web Clusters":
http://docs.google.com/Presentation?id=ajjmkjp3t4zh_1929rzrr6r&invite=g69kswpIt's not an attachment -- it's stored online at Google Docs. To open this document, just click the link above.
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This is the presentation that I gave last night at the SF Bay Area AppEngine users group at the SF Google offices.
The presentation includes:
* an introduction to the problem
* motivation for the solution
* some implementation details
* a discussion of the tricky problems and their solutions
* the problems that could not be solved
* performance information and usage recommendations
* some AppEngine feature requests
Please let me know if you find any errors or omissions! The main discussion group for httpmr is
httpmr-...@googlegroups.com, but I participate in both httpmr-discuss and google-appengine.