No. Applications uses memory just like music does.
As long as your computer has itunes that is authorised on the same itunes account as your iphone, then it will automatically transfer all your iphone apps onto the computer
The Google Play Store and the Amazon Appstore carry about the same amount and kind of apps as Apple's App Store.
A iphone is a droid it has the same internet email apps and more.
Yes
Yes you can as long as your iphone is connected to the same itunes account you bought the apps on.
Yes most of them are the same apps and will work on one or the other or both.
an ipod is very similar to an iphone, just cheaper. you can get apps for an ipod that make it do the same as an iphone
Some can be used on both devices, but some applications are for only the ipad and some are only for the iphone.
It is not bad in itself to have a lot of apps on your iPhone. Some negatives may be if many apps are open at the same time it may slow down your phone and having many apps may take up a lot of space.
The first generation iPhone can have any of the new apps. But the GPS enabled apps won't work as well because the 1st generation iPhone uses cell phone tower triangulation to get its position which is not as accurate as the GPS chip in the iPhone 3G. Other than that the software is the same.
no. there may be the same or similar apps on iphone app store but you cannot use the android version on iphone... just like you cant use pc software on a mac or vice versa...
iPad apps are the exactly the same as iPhone and iPod touchs. Most are free but others are up to 10$