Please change the URL for the NASM package from: http://nasm.sourceforge.net/ to: http://www.nasm.us/ The latter has been official for a few years now.
nasm-2.09.03-2.fc14 has been submitted as an update for Fedora 14. https://admin.fedoraproject.org/updates/nasm-2.09.03-2.fc14
nasm-2.09.03-2.fc14 has been pushed to the Fedora 14 testing repository. If problems still persist, please make note of it in this bug report. If you want to test the update, you can install it with su -c 'yum --enablerepo=updates-testing update nasm'. You can provide feedback for this update here: https://admin.fedoraproject.org/updates/nasm-2.09.03-2.fc14
nasm-2.09.03-2.fc14 has been pushed to the Fedora 14 stable repository. If problems still persist, please make note of it in this bug report.