I can spend hours looking through all the free vectors available online- but the truth is that these are the ones I use the most: they’re vectors of various GUI (graphical user interface) elements, and they’re a must-have for any web or app designer for professional-looking presentations.
One of the very first iPad GUI graphics available, and one of the best. As you can see from the screenshot above, it’s quite comprehensive, and the makers promise to keep it updated with new elements.
More iPhone vector elements, from the makers of the USA TODAY iPhone app. They’ve also got an excellent post on why you should build app mockups in vector format.