If you enjoy photography, iPhoto for iOS could be the best $4.99 you've ever spent on an iPhone or iPad app.
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Ready to start editing your photos? iPhoto provides a lot of great tools, starting with basic ones such as auto enhancement and rotation. But you'll probably spend most of your time with the five tool icons in the lower left corner: crop and straighten, exposure, color, brushes, and effects. Effects, which iPhone cleverly displays like a paint-store fan deck, let you experiment with six filter sets: Warm & Cool, Duotone, Black & White, Aura, Vintage, and Artistic.