How to Create A Collection
How to Implement Click Scoring
How To Index and Search Web Content
How to Index Database Content
How to Index File System Content
How to Schedule Crawls
Scaling up Solr 4.1 to Power Big Search in Social Media Analytics
Personalized Search on the Largest Flash Sale Site in America
Handling Realtime Item Availability in eShop, Mikhail Khludnev
CMS Integration of Apache Solr - How we did it.
Solr at Zvents, nearly 6 years later and still going strong
Using Solr/Lucene to Build Advertising Systems
All Lucene/Solr - All the time.