Its quite hard to give an unambiguous answer because its quite a vast subject with many niches in it and what some people consider a trend, others might not. N

Its quite hard to give an unambiguous answer because its quite a vast subject with many niches in it and what some people consider a trend, others might not. Node.js, has got a lot of press at least here on HN as well as other places. Obviously HTML5/CSS3 and associated technologies now being implemented in the browsers. Javascript is still going very strong, i think it'd be fair to say if you dont know JS well then you're at a significant disadvantage, even with the likes of JQuery that makes it easier. NoSQL is also an already vast area worth research that is continually growing. Game mechanics, location aware sites, scaling issues and as always API availability come up often. I've probably missed a few things that others will suggest, but i wouldnt worry about it too much, once you hang around for a while in the communities over the internet you'll notice the trends for yourself.