The Notam facility at fly.dsc.net is now pretty well tested now and has been very well received. You can use it to get a route brief online in less than 30 seconds. The URL to read more about it is:
http://fly.dsc.net/u/Notams
As explained therein, unfortunately there is no reliable free source of the Notam data which makes the job quite difficult. As such you should be very careful to check the indication at the top of each briefing to see if it is using the current data. And even then, of course, it's not "official".
Both area and route briefs are very quick. It covers quite a few FIR, not just the UK ones. There are lots of output filters and the results are designed to be easy to read. You can also plot whatever you find on a Google Map. Lastly the text briefs have been shown to be useable even on a PDA or Blackberry browser, over a slow connection.
Here's a couple of screen shots.
