HBase's introduction into the Yahoo! Grid has provided our users with new ways to process and store data. A year after its availability, there has been varied usages: Event processing for personalization, incremental processing for ingestion, time-based aggregations for analytics, etc. All these were possible thanks to features HBase brings beyond working with HDFS files. This talk will review some recurring HBase design patterns at Yahoo! as well as share our learnings and experiences.