If you want to use buildroot to build your own image, you'll need these files:
Patch for buildroot 2011.08 to build Brandy BASIC: buildroot-2011.08-brandy.patch
Config for buildroot 2011.08 to build the image: config-brandy
If you have Qemu and want to run a pre-canned image, download the following files, uncompress the qcow2 image, then run the start-brandy.sh script:
Ready to run Qemu image: brandy.qcow2.bz2
Kernel (Debian one): vmlinuz-2.6.32-5-versatile
Initrd (Debian one): initrd.img-2.6.32-5-versatile
Script to start Qemu: start-brandy.sh