Seems like more than enough for simple sites shared with a bunch of people you know. That is about 600 GBs of bandwidth a month, for free.

If you need more bandwidth, you would probably be looking at any of the other innumerable hosting solutions available on the web.

That's PER link, so you can drop it in another folder, change the link, and maybe it refreshes since it's a different link? Can someone from Dropbox confirm this?