[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: add simplegeo slides.
http://wiki.apache.org/cassandra/ArticlesAndPresentations?action=diff&rev1=89&rev2=90

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  = Case studies =
   * [[http://www.subelsky.com/2010/05/real-world-ruby-and-cassandra.html|Real-world Ruby and Cassandra at OtherInbox]]
   * [[http://blog.reddit.com/2010/03/she-who-entangles-men.html|Reddit's switch from memcachedb to Cassandra]].  There are more comments by the Reddit engineer who did the work, ketralnis, in the [[http://www.reddit.com/r/programming/comments/bcqhi/reddits_now_running_on_cassandra/|reddit discussion thread]].
-  * SimpleGEO's use of cassandra, [[hriattp://radar.oreilly.com/2010/03/joe-stump-talks-location-and-n.html|an interview with O'Reilly]] and another [[http://stu.mp/2010/03/nosql-vs-rdbms-let-the-flames-begin.html|blog post with some infrastructure details]]
+  * SimpleGEO's use of cassandra, [[hriattp://radar.oreilly.com/2010/03/joe-stump-talks-location-and-n.html|an interview with O'Reilly]], [[http://stu.mp/2010/03/nosql-vs-rdbms-let-the-flames-begin.html|a blog post with some infrastructure details]], and [[http://www.slideshare.net/mmalone/scaling-gis-data-in-nonrelational-data-stores|slides from engineer Mike Malone]]
   * [[https://www.cloudkick.com/blog/2010/mar/02/4_months_with_cassandra/|4 Months with Cassandra, a love story]] by Cloudkick
   * [[http://nosql.mypopescu.com/post/407159447/cassandra-twitter-an-interview-with-ryan-king|Cassandra @ Twitter: an interview with Ryan King]]
   * [[http://blog.sematext.com/2010/02/09/lucandra-a-cassandra-based-lucene-backend/|Lucandra, the lucene + cassandra engine powering sparse.ly]]