Wonderful idea - but with reservations.
Such group blogs and chats often have a high noise to substance ratio, and quality participants often do not see the time invested in such efforts at community building worthwhile when that community is not directly affiliated to a professional hard-science organization. This said - it is laudable to seek to build community and spread the science beyond ivory towers - and provide a venue where bold ideas can be vetted without undue criticism.
Hence my original statement to it being a wonderful idea - with fingers-crossed.