According to https://launchpad.net/isight-firmware-tools/ , 1.6 is the latest version. I also suggest changing HOMEPAGE to the above URL, because the current one contains outdated information. Thanks.
+*isight-firmware-tools-1.6 (18 Dec 2011) + + 18 Dec 2011; Gilles Dartiguelongue <eva@gentoo.org> + +isight-firmware-tools-1.6.ebuild: + Version bump, thanks to Davide Pesavento for reporting bug #393015. Thanks for reporting.