Downloading data on iPhone, but it won't sync on to computer?

Okay so I have an iPhone 4, running the new ios, and have a windows 7 laptop. I download updates to apps and download new podcasts etc., but whenever I plug in my phone into my computer, the iphone is detected, but the apps in iTunes still haven't been updated nor have the podcasts appear in iTunes, and it is such a pain to download everything via iTunes store on the computer… Any ideas why my phone isn't syncing this stuff?

Try to unsync