Linaro GDB is a branch of FSF GDB that contains ARM focused features and patches.
This project contains backports of work that we and the community have done to improve GDB on ARM.
Releases are made monthly and consist of a source release that is a drop-in replacement for FSF GDB. You can then configure and build the source release for your particular use. See:
Want native binaries? The GDB package in Ubuntu Maverick and later already includes the Linaro changes.