Sony’s had a huge Friday. It’s made a smart move by growing out of DRM in its music division — at least a little, at least reportedly — and it’s scored a decent victory on the Blu-ray side in getting Warner Bros. to commit to its hi-definition DVD format. All on the Friday before CES. Nicely done. It’s easy enough to be hard on Sony. It slips on a lot of banana peels, and when it does, it tends to make a lot of noise.