Create an apache config file for dropbox

sudo vi /etc/http/conf.d/dropbox.conf

paste in the below code - replacing 'username' with your user

 Alias /dropbox /home/username/Dropbox/htdocs 
<Directory /home/username/Dropbox/htdocs/>
   order allow,deny
   allow from all
   #Deny from all
   allow from 127.0.0.1
</Directory>

Create a htdocs folder in your dropbox directory 

 
mkdir /home/username/Dropbox/htdocs 

 
Allow Apache access to your home dir 

 
chmod 755 /home/username 
chmod 755 /home/username/Dropbox 
chmod 755 /home/username/Dropbox/htdocs 

Reload the Apache conf

sudo /etc/init.d/httpd reload

Done, now http://localhost/dropbox is stored in dropbox