All-In-One-Favicon looks like a great plugin! ...However it does not work with 3.0.1 in Multisite mode. I installed it using the WordPress built-in installer, and it caused the site to fail with PHP errors. Removed it with FTP and got site back, then attempted to install with unzip-and-ftp method. Same result. Did not matter whether it was installed in
Looks like a very useful plugin -- which would solve the problem that Multisite has with not being able to set favicons on a per-site basis without creating child themes for individual sites.