Is there anyway to track your downloaded history of apps, so I can keep the ones I dont use on my phone on my PC?
In itunes go to prefrences and then it says "show:" and check "applications" Then you can see all the apps you have on your comp.
All the apps that i download to the iPhone are stored in my iTunes when i sync the phone. Even if you delete them from your iPhone, they will still stay in your iTunes, if you synced them earlier
Or when you have your idevice plugged in. In itunes go to the tab "applications" and there will be a whole list of all your apps you can check and uncheck any of them.