[Cassandra Wiki] Update of "ArticlesAndPresentations" by JonathanEllis

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The "ArticlesAndPresentations" page has been changed by JonathanEllis.
The comment on this change is: link Chirper.
http://wiki.apache.org/cassandra/ArticlesAndPresentations?action=diff&rev1=92&rev2=93

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  ## page was renamed from Presentations
  = Recommended (read these first) =
   * [[http://www.parleys.com/#st=5&id=1866|Introduction to Cassandra at FOSDEM 2010]] (video + slides)
-  * [[http://www.rackspacecloud.com/blog/2010/05/12/cassandra-by-example/|Cassandra by Example]], an explanation of the [[http://github.com/ericflo/twissandra|Twissandra]] data model and code.  A demo is up at http://twissandra.com/
+  * [[http://www.rackspacecloud.com/blog/2010/05/12/cassandra-by-example/|Cassandra by Example]], an explanation of the [[http://github.com/ericflo/twissandra|Twissandra]] data model and code.  A demo is up at http://twissandra.com/.  [[http://www.javageneration.com/?p=318|Chirper]] is a port of Twissandra to C# and [[ClientOptions|Aquiles]].
   * Maxim Grinev's posts on [[http://maxgrinev.com/2010/07/09/a-quick-introduction-to-the-cassandra-data-model/|modeling basics]], [[http://maxgrinev.com/2010/07/12/do-you-really-need-sql-to-do-it-all-in-cassandra/|translating SQL concepts to Cassandra]], and [[http://maxgrinev.com/2010/07/12/update-idempotency-why-it-is-important-in-cassandra-applications-2/|update idempotency]]
   * [[http://www.cs.cornell.edu/projects/ladis2009/papers/lakshman-ladis2009.pdf|Facebook's LADIS 2009 whitepaper]] (heavy on Cassandra internals)