IcedTea, gcjwebplugin and Cortado (ogg/theora streaming)
With IcedTea installed, which includes gcjwebplugin, I was browsing a little and suddenly hit a streaming ogg/theora video that used the Cortado applet. And it just worked! Including sound support! So install the latest IcedTea and Try It Out!. A full GPLed streaming video and audio stack. How wonderful!