Inobscuro.com has created a wide variety of useful Adobe Photoshop Brushes using her own drawings and photos, and they should work in Adobe Photoshop 7, CS, CS2 and CS3.
If you are looking for information on how to use the brushes or how to create your own custom Adobe Photoshop Brushes then you can also check out this tutorial of his: Photoshop Brushes Tutorial. Enjoy!