Design a Twitter Like Application with Nati Shalom
From the description:
Design a large scale NoSQL/DataGrid application similar to Twitter with Nati Shalom.
The use case is solved with Gigaspaces and Cassandra but other NoSQL and DataGrids solutions could be used.
If you enjoyed the posts I pointed to at: Building your own Facebook Realtime Analytics System, you will enjoy the video. (Same author.)
Not to mention Nati teaches patterns, the specific software being important but incidental.