Photoshop Tutorials by Jennifer Apple offer tips and techniques for using Adobe Photoshop for adjusting overexposed and underexposed images, along with many other tips and techniques for using Photoshop with your photographs such as resizing images without blur and tips for beginners to help get you started using Photoshop.
I’ll be looking for more websites which offer Photoshop and digital photography tips and techniques soon, so if you have a favorite, please let me know!