Comment 62 for bug 331369

Yes, you have to create the new key at your own, that's true.

The coordinate depends on your screen resolution and your preferred position....

Ex. I have 2 17" TFTs, with 1280x1024, i wish to have the notifications on the first screen at the top right corner, so i have to set the x value to 900, because the popups are a bit more than 300px width, and 1280 - 300 = ~900

With the value 0 you have the popups at the top left corner of your screen...

To create the key (how Raybuntu wrote):
gconftool-2 -s /apps/notification-daemon/x --type=int [calculatedValue]

Thank you for building the package! Now it's not only for developers;-)

Andreas