Touch and multiple iTunes computers

So my dad bought my mom an iPod touch for Christmas, but they don't ow a computer (they really have no need for one). Instead they will be relying upon my uncle, my brother and me to put content onto the device. Each of us already owns an iPod (I have a touch, and the others have nanos and classics). My brother (who lives 4 hours drive away) initially set up the device and purchased several albums from ITMS for her to have something to hear on the big day. Also on there are quite a few photos of her grandson, supplied by my brother.

My question is, how much of an issue is it going to cause for multiple people to keep this iPod full of the music and pictures from multiple computers? None of us will be interested in listening to the content from the device, but I guess we'll all have to use the same ITMS account for purchasing content - is that right?

Any help would be appreciated - I'm not a noob with the iPod touch, but I've never faced this question before!