Regarding the Black Rock, just thinking out loud here so humor me:
It seems the general consensus is that this is some old boat, either a slaver or taking prisoners to Australia.
Is it at all possible that this ship is more recent than that. Granted the style makes it appear to be something from the past, but it doesn't necessarily mean that it is.
Is there a link to the damn thing?
To recap what we know about the ship:
1. Dynamite was unstable
2. Some people were shackled inside - could the skeletons really be Rousseau's old team? She said that the Black Rock is where things started to go bad for them.
3. Locke said it appeared to be a mining ship (HTF does he really know?)
4. It seems to be some distance from shore
5. However, none of the wood was rotten, if that boat had been out there for 100+ years, in that jungle, there shouldn't be that much left of it
Any other random thoughts?