The second link is basically a modification of the method from the first link, and has been working well for me for a few weeks. One caveat is that any apps which make us of dropbox for syncing (e.g. 1Password) seem to automatically use the first/normal dropbox instance, which can't be changed.
http://www.dropboxwiki.com/Multiple_Instances_On_Unix
http://theterran.com/blog/2012/6/14/use-two-dropbox-accounts...
The second link is basically a modification of the method from the first link, and has been working well for me for a few weeks. One caveat is that any apps which make us of dropbox for syncing (e.g. 1Password) seem to automatically use the first/normal dropbox instance, which can't be changed.