Proposals: Open Science and Open Data
There is an existing beta called Open Data. It's been around for about 16 months, and looks like it could use a hand in generating critical mass. I'm not an expert in Open Science or Open Data, but looking at the example questions at Open Science, most of them look like they might be on-topic at Open Data.
Has a merger been considered? Given the low volume on both of these proposals, you might find it more productive to work together than compete.
I would say both intersect, but have big fields where there is no common interest. For example research discipline specific data-structures are not of primary interest for data-journalists using open data, and the process to open up data from institutions on the long run is for most researchers also not of interest. But of course, both can learn from each others and reduced redundancies - and should so by actively decide to join both groups.
Additionally, Open Science consists of way more than Open Data (i. e. Open Notebook Science, Open Access, Open Peer Review, Open Educational Resources, and Open Source), so if all this fields are included in all it's ways, the group would be very diffuse and big. Think to keep the focus on science in it's big sense (with humanities, arts, social sciences) is a big enough challenge to bring a lot of different approaches and communities together.
See my answer to a very-closely related question regarding proposed StackExchange=Open Source, in which I explicitly address overlap with beta StackExchange=Open Data.
