DEVONthink (Dt from here on) is an amazing application, and the more I use it, the more I come across things I want to do with it. One of its limitations, however, is that you're limited to one database with the personal version, and the Pro version still hasn't been released (plus, the Pro version will cost more money once it is released). For those wanting to run multiple databases now, using the Personal version, here's my solution...
Like many apps, by default, Dt stores its database under the folder ~/Library/Application Support/DEVONthink. However, you can get around this limitation by creating several databases, and then symbolic linking the database you want to use to the aforementioned ‘Application Support' folder, replacing Dt's original folder with the symbolic link. Some of you may already know about doing this, as this works for a lot of applications under OS X, and most Unix-based machines.
What I did was created several databases by copying the original ‘virgin' copy of the Dt database folder (again, ‘~/Library/Application Support/DEVONthink'), moving them into a separate folder under my Documents folder. I then created several short, executable, Unix scripts which handle removing the old symbolic link and replacing it with a symbolic link to one of the new databases. After that, I used the free, and amazing Platypus GUI creator to create a clickable iconized version of each of these scripts, so that I could click an icon, rather then open a terminal to run these.
So, here's a recap of the steps, along with some examples:
#!/bin/sh
# Remove old link:
rm "/Users/amh/Library/Application Support/DEVONthink"
# Create new link:
ln -fs "/Users/amh/Documents/Program Settings/DEVONthink/Ebooks" /tmp
# Rename new link to "DEVONthink":
mv /tmp/Ebooks /Users/amh/Library/Application Support/DEVONthink
# Launch DEVONthink:
open -a DEVONthink
After the script is created, chmod it to 0777 in order to make it executable. If you want, you can also download Platypus, load your new script into it, and create a clickable icon for the script.Mac OS X Hints
http://hints.macworld.com/article.php?story=2005021214383761