Koha 3 stable version now released.  You can download from the usual location:

http://download.koha.org/koha-3.00.00-stableRC1.tar.gz

1. Zebra plugin - Zebra is a high-performance, general-purpose structured
text indexing and retrieval engine

2. New installer - based on the common Perl module ExtUtils::MakeMaker, the
new installer makes it a snap to get Koha running on just about any platform.

3. Standard APIs - Koha 3 supports a number of important library search and
retrieval standards and microformats, such as SRU/W, Z39.50
and COinS/OpenURL. Also supported is the popular Internet standard: OpenSearch
(http://opensearch.a9.com/) created by Amazon's A9.

Records are stored internally in an SGML-like format and can be retrieved in
MARCXML, Dublin Core, MODS, RSS, Atom, RDF-DC, SRW-DC, OAI-DC, and EndNote;

4. Cross-platform, multi-RDBMS, Web-server agnostic - Run Koha on the platform
of your choice: Linux, Windows, Mac OS X, FreeBSD, Solaris. Koha 3 also
includes better support for multi-RDBMS (MySQL 5.0 and PostgreSQL), and runs
under Apache2, IIS, or the web server of your choosing.

5. Multi-lingual support - Koha was designed from the ground up for multilingual
libraries. Koha 3 can handle Chinese, Japanese, and even right-to-left languages
such as Arabic and Hebrew with ease (BiDi).

Koha's index engine (Zebra) can handle record formats containing any UNICODE
compliant script, such as Arabic, Chinese, Hebrew, Japanese and Korean. Zebra
has this support via the ICU libraries created and maintained by IBM.

6. New templates - Koha's staff and patron interfaces are developed with a
template system that's easy to theme.