The browser might be ready but the add-ins are not. I just installed Unbuntu 8.04 Hardy and the FF v3 beta 4 worked great, however 70% of my add-ins didn't work. Including things like Filter-set G (must for add blocking), Tab Mix Plus and FoxMark book mark Synchroniser, CustomizeGoogle. Things I can't live without. SO I went back to FF2. By the way you can have both installed and only minor problems using them with same settings. Don't launch at same time though