We have just released wxWidgets 3.0.1, a bug fix release in 3.0 branch. The release files can be downloaded from either SourceForge or our FTP mirror as usual, and as less usual, but is the case for the last few releases, we provide not only the sources and documentation, but also the binaries for the selected Windows compilers.
This release is 100% compatible with 3.0.0, i.e. any code which compiled and worked with 3.0.0 continues to do so with 3.0.1 and so upgrading to 3.0.1 doesn't require any changes and hence is recommended for all 3.0.0 users: basically, without any extra effort on your part (even make or project files don't need to be updated as the libraries use the same names in 3.0 branch), you get more than a hundred bug fixes and improvements.
The release announcement has some details about the changes in this release, but there were really too many of them to list them all, so you should consult the description of the most important changes in the change log directly to really appreciate the scope of the work gone into this release (and the change log doesn't contain relatively unimportant fixes).
Finally, in addition to the bug fixes, if you are using Microsoft Visual Studio 2012 or 2013, there is an extra reason for upgrading to 3.0.1: this release includes the project and solution files for building the library with these compilers, so you don't need to upgrade Visual Studio 2010 projects manually any longer. These projects have been contributed by Artur Wieczorek and I'd like to use this opportunity to thank him for this and numerous other enhancements and bug fixes, especially in wxMSW, as Artur managed to eradicate many bugs that I couldn't fix since many years and is responsible for a good part of the 100+ bug fixes mentioned above. Thank you!