Planet big data (http://planetbigdata.com) is an aggregator of blogs about big data, Hadoop, and related topics. In terms of volume of news, it is a step up from Dataversity with up to half a dozen items daily.
BigData Startups (http://www.bigdata-startups.com) is a European site that is making an effort to track the ‘market buzz’ - especially emerging companies. Hundreds of companies are profiles so it can be a bit overwhelming for those new to Big Data.
R bloggers (http://www.r-bloggers.com) is more for practitioner Analysts and may be overwhelming for those new to Big Data - but it is a fantastic resource for anyone using the R language to do real stuff. And besides, a list of Big Data sites just has to include one covering the R community because it is such an important open source movement. Don’t let anyone tell you that R is just a fringe technology. A huge list of organisations use it - from the biggest multinationals to the smallest startups.
Finally, if you are using a particular tool or solution - then find a good source of information for that and get into the habit of checking those sites regularly.
If you use all or some of the sites I have mentioned then you will quickly absorb a lot of new information about Big Data - but don’t forget to look at these sites critically as you’ll get a lot more of of them that way!