In the last few years, a number of new technologies have popped up, died, shifted, etc. DaniWeb here has kept up with the changes, and I am grateful.
There is a new technology though that has, to my surprise, actually taken off, and is making a name for itself. I speak of SilverLight from Microsoft. Doing a search here, I found over 400 topics using just the keyword "Silverlight". I think that it would be helpful to a lot of people, and this is solely my opinion, and not based in hard evidence, to have an area specific to SilverLight under Web Development. Potentially, it could go under Windows Software, Mac software, or ASP.NET, but if you read Microsoft's documentation for it, it could potentially go under PHP as well.
SilverLight is a powerful newcomer to the Web World, and I believe it will go far. I'd like to have an easy place to ask questions, post ideas, and get feedback on topics that isn't monitored or moderated by Microsoft employees. I don't have a high opinion of them...