Last week Python version 2.3.5 was released. There are specific Windows-binaries on the download page, all others should download the source release. The changelog can be read here, an important fix being the security update to SimpleXMLRPCServer.
Note: this is a release for 2.3.x users not being able to switch to 2.4.x for some reason. If you already use 2.4.x, don’t bother (but don’t forget about the security fix).