I have kegged a nut brown ale and it turned out awesome. I would like to put some of it in bottles to save it and ship to friends. Is that possible? Would I need to do anything to it before putting it in the bottle?
While a beer gun is not the only weapon of choice, counterpressure filling is definitely the way to go. Whatever you do, purge your bottles of CO2 first in order to keep as much oxygen out of the bottle once you cap it; oxygen will oxidize your beer over time (and more quickly if it gets shaken up during shipping) and produce "wet cardboard" aromas. Also keep in mind that even with proper purging you won't have any appreciable amounts of yeast left in the beer to act as an oxygen scavenger, so your shelf life will be limited.
During shipping your beer will be exposed to adverse conditions. Depending on the stability of the beer higher temperatures may shorten the shelf life, and depending on sterility higher temperatures may promote bacterial spoilage. So the advice would be to ship and drink fairly quickly.