For some reason after 5.1 release, i can't update my apps in my iPhone 4 which is still in 5.0.1 every time i click update the apps just say Waiting and nothing happen. I tried restart the phone and do it another day, it still not work.
had this problem recently
iPhoneBrowser or iExplorer
You do not need a jailbroken device to do this
1.Plug your iPod/iPhone/iPad into your computer. You don't need to let it sync
2.Open iExplore and let it load
3.Open the directory labeled "Downloads" (On jailbroken devices that should be "/var/mobile/Media/Downloads")
4.Delete all files in this folder*
5.Close iExplore and reboot your device
if its jailbroken just use ifile