The new version of Gentium, a Unicode typeface family designed to provide well designed characters for all the Latin (and Greek, and soon Cyrillic) characters in Unicode, is available under the SIL Open Font License which allows modification and redistribution of the font. All you multilingual font designers out there, hop on.
I last wrote about Gentium in 2003, which is the source of the leading quote on the main project page for Gentium. Maybe I’ll play with it again to see if the bold weights have been improved—or the size on Windows machines.