Lucene's Latest (for Libraries)
"Solr Update" at code4lib '13 - Chicago
Solr 4
Solr Powered Lucene
Solr: Search at the Speed of Light
Query Parsing - Tips and Tricks
Solr Recipes
Solr-ruby: the best open source search engine + ruby
Introduction to Solr
What's New in Solr 3.x / 4.0
Solr Recipes Workshop
Solr Application Development Tutorial
code4lib 2011 preconference: What's New in Solr (since 1.4.1)
Solr Powered Libraries
Solr Indexing and Analysis Tricks
Solr Flair
Solr Flair: Search User Interfaces Powered by Apache Solr (ApacheCon US 2009, Lucene Meetup)
The Rising Sun: Making the most of Solr power
Lucene for Solr Developers