www.bythom.com
Good place for Nikon users looking for camera and lens reviews.

www.photo.net
An extensive photographers' community with good forums and great photos.

www.fotki.com
A great place to store your photos online.

www.winkflash.com
An online photo developer. Look for 50% discount codes in photo magazines.

www.popphoto.com
Official website for Popular Photography magazine. Good articles, not so good reviews.

www.ebay.com
If you are a photographer, you are already using it!