Not sure for ATV2 but I can tell you how to install from git. I always install from git on my test machine and then push the Pandora folder to all of my xbmc machines and drop it in the addons folder. I assume you could do this on a windows/linux/max machine and ssh them to the ATV2. Here is how you use git to install Pandora in Windows. Adapt this to your OS of choice.
First install Git. Its available on multiple platforms. If you don't know how to install it then use google.
open the git command terminal and change directory to the addons folder
Code:
cd '/c/Users/CPU Name/AppData/Roaming/XBMC/addons'
Now pull the files from the git repository
Code:
git clone git://gitorious.org/xbmc-pandora/xbmc-pandora.git
This will download the addon and put it directly into your XBMC addons folder.
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In the future when spbogie updates the addon you can do a quick update.
To update:
Open git and change directory to the Pandora addon
Code:
cd '/c/Users/CPU Name/AppData/Roaming/XBMC/addons/xbmc-pandora'
Then pull any updates
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spbogie, feel free to copy this into the first post. I think it will help a lot of people out and its just going to be buried in a day or so and people will ask again.