I was just using DiskInventory (a great little application if you don't already have it) to look what files are taking up space on my HDD and noticed the iPhone software updates were still on my computer (user>library>itunes>iphone software update 1.1.x). Is there a reason that I would need to maintain these large files on my computer if I have already applied the relevant updates to my iPhone? Nothing really comes to mind as for why I would need these files, but hey that's why I'm asking you all.