Here you may get 3 sets of professionally designed banners. Each set includes 10 PSD files in top sizes for Google AdWords: 160x600px, 300x250px, 300x600px, 320x100px, 336x280px, 468x60px, 728x90px, 970x250px, 600x314px, 300x300px
The banners meet Google requirements, but they can also be used for any adverting purposes.
The PSD files are well organized, so it is easy to customize the content. Free fonts are used.