#1 I really like the "Cut and Paste Reuse Tracking" proposal - its novel but also connected to "real world" use. I suspect its actually the most technically challenging in reality but well worth pursuing.
#2 I don't think OER Bookmarking is viable as it really would have to be "another delicious". HOWEVER - If it were instead a proposal to try to work with Yahoo! and other sites to offering bookmarking to get them to integrate better licensing into their sites, that would potentially be a far more interesting proposition though obviously with less predictable outcomes. (Another option might be to work with oEmbed. That probably goes for #1 too)
#3 I think vocab management tools is a non-starter as vocabularies are principally a system-wide management and sustainability problem not a technical problem.
#4 And finally, the ORE one is a repository.
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