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.