I wanted to give opera 10 a try and soon discovered it is very fast,but,just don't have enough extensions like Firefox but fast as it is I use it quite a lot just for surfing around. My problem after the download was that I went to youtube and I had audio but no video, so I am looking for a quick fix and found it.
Go over to softpedia and download the flash player for 64bit Linux to your desktop as a tar file and right click on it and extract here. You will end up with a libflashplayer.so file, press alt+F2 and type in gksudo nautilus, navigate to the file system then usr/lib/opera there should be a folder called plugins there. Drag and drop the libflashplayer.so file into this folder and now you should be able to open opera 10 and watch some youtube.
Remember this is for the 64bit system, I am running it now and it is working great for me I hope it works great for you guys also, lets make it simple, the simpler the better.