First post from a non apple user.......iPad on order

Deleting files:

After watching media on your iPad such as a movie, TV show, podcast or a listening to a song , can it be deleted using the iPad or does it need to be synced with iTunes on a mac/pc to delete?

Updated Post: After thinking about deleting files, what about adding files. If you visit the istore while using the ipad and grab a podcast or buy a movie/song/app do you save it there and then on the ipad or do you have to connect to a pc/mac and then buy the item?

External Keyboard:

Are games for the iPad designed to be controlled with an external keyboard?