• Support for binary stored fields and stored compressed fields.
• A new DateTools allows formatting of dates in a readable format adequate for indexing. Unlike Lucene's existing DateField, DateTools can handle dates before 1970, and forces the specifying of a desired date resolution, making RangeQuerys more efficient. In addition, a new RangeFilter is a more generically useful filter than DateFilter filter on date ranges.
• Lucene's QueryParser now works with Analyzers that can return more than one token per position: A query such as "+fast +car" would be parsed as "+fast +(car automobile)" if the Analyzer returns "car" and "automobile" at the same position whenever it finds "car."
• The new NumberTools utility helps index numeric fields.
• Two new regular expression queries, RegexQuery and SpanRegexQuery, were added.
• The new DisjunctionMaxQuery provides the maximum score across it's clauses, which is useful for searching across multiple field.
• The newly added public static IndexReader.main(String[] args) method in IndexReader can now be used at the command line to list and optionally extract the individual files from an existing compound index file.
• The new ParallelReader is an IndexReader that combines separate indexes over different fields into a single virtual index.

Have you used Lucene in your projects?