Nature just launched Nature precedings , a home for Pre-publication research and preliminary findings. Within seconds of browsing through its very intuitive interface I immediately got the purpose of this offering from Nature Publishing group.
The way it works is simple- you can upload content in the form of word documents , powerpoint files and pdf files and it gets released to the community after a preliminary check for appropriateness of content and suitability for the nature precedings audience. Signed up users can then vote on the content ( a la Digg) and it gets moves up or down its category. All of the content is also search-able and link-able and citeable.
As the help pages suggest, I hope the site serves , in the least as a repository of supplementary material and science findings related to published work anywhere, which can then be commented on and discussed.
More interestingly the FAQ page, informs us that the Nature publishing group Journals do accept material that is in the un-peer-reviewed form and that has appeared in the preprint form : So if i get together a manuscript , I can first post it on Nature precedings and then send it for consideration to Nature for review separately and nature would still consider it ( if it meets its other criteria of course).
So this site could be a great place to establish the provenance of ideas, i.e I have a great new finding , I am gutsy enough to write it up in some form , post it on Nature precedings ..and then a few months later send the finished work to a print journal like a Nature publishing group journal that would accept it.
With all of this Nature precedings has the great potential to become an online repository of pre-print findings , supplementary material and other content of use to the science community…I really cant wait for the first paper to make it from Nature Precedings to the real thing , Nature itself with a citation that first appeared online!.
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The Omics world 
Keep a good work man!,