Availability of web site
I disagree with David's comments about a web based application being too unreliable to deliver NOTAM information.
Think of the web based systems which, for example, transact billions of dollars worth of securities on a daily basis for the world's investment banks - do you think they'd do this if it couldn't be made reliable enough (for reasonable cost)?
Having said all that, the AIS web site has some way to go. I've been monitoring it (automatically) for 48 hours now and in that time it has been available only 67% of the time. In particular it was completely unavailable for over 7 hours starting at 22:51 last night.