Following on Tina's useful summary from last night, a fellow named James Cridland has been tracking reports of rioting and mapping them with pictures and other relevant links. This is the London view but zoom out to see where it has spread to (spread? sparked?) to Birmingham.
There's a lot of compelling video out that, as you've no doubt seen. This morning I've been listening to LBC radio, which is news and talk. I don't know anything about this stations usual format, but for this emergency it's been an interesting outlet for information and reaction. Let me know if you've found a good live London news source.