Also, the FB manual was recompiled to fix a missing-content issue with the CHM's index.
Besides that, there have been some smaller fixes regarding the FB compiler/libraries, you can find them listed in the changelog.
0.21.1 Compiler Downloads
- Windows Version, Installer
Windows Version, .zip Archive
Linux Normal Version, preconfigured for installation at /usr/local, .tar.lzma Archive
Linux Standalone Version, .tar.lzma Archive
DOS Version, .zip Archive
0.21.1 Source Code Downloads
There are more downloads available over at SourceForge.