LINKS

Shutterfly
A close second for on-line processing. I really can't say anything negative about them over Sony, but I think the Sony interface, web-portal and overall pricing is what had me use them first. Oddly when I want an 11x17 (a non standard size with ImageStation) I use Shutterfly.
 

Penn Camera
If I purchase anything photographic. I first check with my local retailer Penn Camera. While I don't so much need the advice or vast experience of their friendly staff I can say this, as a local vendor they are extremely responsive to any problems I may encounter with a purchase and time and time again I have found them to incur costs to remedy a situation that is of no fault of their own. Were I to have made those purchases mail-order I would have more down-time and expense. Please do try them first.

B&H
For everything else I do use the behemoth B&H. Their web-store is as easy to use as they come, they have everything you could ever imagine for sale (and some things you wonder who buys the stuff) BUT, I will say this, should you need to contact them, or require help with something other than a perfect item, you will probably be in the unfortunate boat of being able to learn why I try to shop locally first.

Canon
One of the top manufacturers of photographic equipment. From hobbyist to advanced they cover the range.

Nikon
An Icon in the photography world and currently the brand with probably the most diverse and impressive offerings in Digital SLR's (I am a Canon user but Nikon has quite a line-up currently) As a historical note the first 35mm rangefinder cameras produced in Japan in the 1930's was a Canon (then called Kwanon) that utilized a Nikon lens (Nikon weren't making bodies yet)

Olympus
One of the top brands in the Point and Shoot market. Feature laden and excellent value and quality a brand that is hard to go wrong with.
 

Sony
The giant. Sony has been for some time the worlds largest provider of CCD chips (the part of the digital camera that converts light into electrons). Many camera brands have as their "heart" Sony Sensors. Sony Corp also recently acquired the Konica-Minolta company which now ushers in an age of Sony produced Digital SLR cameras.
 

Digital Photography Review
A fantastic site that provides an incredible mix of product reviews and end user forums. Thinking about buying a new camera? Jump onto the relevant DPReview forum to see what current owners have to say about their real-world experiences with the camera you're considering, be warned, people with issues tend to be more vocal than happy ones. You'll quickly learn about Trolling and the ferocity with which some brand devotees will rally their flag.

Canon Camera Museum
A fascinating site that chronicles the entire Canon Camera history, more information collected than I ever imagined a company would keep.