I've pushed the final release of Protobuf 2.3.0: http://code.google.com/p/protobuf/downloads/list
Documentation updates are still in review but I hope to have them up Monday.
2009-01-08 version 2.3.0:
General
* Parsers for repeated numeric fields now always accept both packed and
unpacked input. The [packed=true] option only affects serializers.
Therefore, it is possible to switch a field to packed format without
breaking backwards-compatibility -- as long as all parties are using
protobuf 2.3.0 or above, at least.
* The generic RPC service code generated by the C++, Java, and Python
generators can be disabled via file options:
option cc_generic_services = false;
option java_generic_services = false;
option py_generic_services = false;
This allows plugins to generate alternative code, possibly specific to some
particular RPC implementation.
protoc
* Now supports a plugin system for code generators. Plugins can generate
code for new languages or inject additional code into the output of other
code generators. Plugins are just binaries which accept a protocol buffer
on stdin and write a protocol buffer to stdout, so they may be written in
any language. See src/google/protobuf/compiler/plugin.proto.
**WARNING**: Plugins are experimental. The interface may change in a
future version.
* If the output location ends in .zip or .jar, protoc will write its output
to a zip/jar archive instead of a directory. For example:
protoc --java_out=myproto_srcs.jar --python_out=myproto.zip myproto.proto
Currently the archive contents are not compressed, though this could change
in the future.
* inf, -inf, and nan can now be used as default values for float and double
fields.
C++
* Various speed and code size optimizations.
* DynamicMessageFactory is now fully thread-safe.
* Message::Utf8DebugString() method is like DebugString() but avoids escaping
UTF-8 bytes.
* Compiled-in message types can now contain dynamic extensions, through use
of CodedInputStream::SetExtensionRegistry().
* Now compiles shared libraries (DLLs) by default on Cygwin and MinGW, to
match other platforms. Use --disable-shared to avoid this.
Java
* parseDelimitedFrom() and mergeDelimitedFrom() now detect EOF and return
false/null instead of throwing an exception.
* Fixed some initialization ordering bugs.
* Fixes for OpenJDK 7.
Python
* 10-25 times faster than 2.2.0, still pure-Python.
* Calling a mutating method on a sub-message always instantiates the message
in its parent even if the mutating method doesn't actually mutate anything
(e.g. parsing from an empty string).
* Expanded descriptors a bit.
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