The easiest way to share that embarrassing or precious moment you captured with your iPhone camera is to send it directly to Flickr. (Of course, you can also use the Share feature in the brand-new iPhoto ’08, in conjunction with the .Mac Web Gallery.) For photo-sharing sites other than Flickr, look for the option to submit your pictures via email.
1. Get a Flickr Email Address
Sign in to your Flickr account (if you don’t have one, you can get one for free) and go to www.flickr.com/account. Click the Email tab. Then, in the row labeled “Your Flickr upload email,” click the link to create an upload-to-Flickr email address. A page will appear with an email address that reads something like gibberish@photos.flickr.com. Copy (or write down) this email address.

If you want to attach a certain tag every time you upload a photo via email, enter it here.
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2. Add a Flickr Contact
Add the Flickr email address to your contacts. You can do this directly on the iPhone, or you can do as we did and create a contact in Address Book, and then sync the iPhone. By adding the Flickr email as a contact, you won’t have to memorize the email address and type it out each time you want to upload an iPhone pic via email.

Make the Flickr email address a contact so you don't have to type it out every time.
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After you snap an iPhone picture, go to your Camera Roll by tapping the Camera Roll icon that’s to the left of the iPhone shutter button (you can also get to your Camera Roll by tapping the Photos icon on the Home screen). Tap on the pic you want to send; it should appear onscreen. Now tap the arrow-in-a-box icon, located on the left side of the slideshow navigator bar. Tap the Email Photo button, and the iPhone will automatically prepare an email with the image attached.

You can submit photos to Flickr via email.
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4. Submit to Flickr
In a new email, tap the plus-sign (+) icon to add your Flickr email address in the To field. Enter the title for your photo in the Subject field. Type a description in the email’s body, below the photo. To add tags, start a new line of text, then type tags: tag terms here, separated by commas.

You can always make changes later on your Mac.
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5. See It Online
It can take a few minutes for your image to appear on your Flickr page. Consider joining one of the many iPhone photo groups on Flickr: Click the Groups link and search for the term iPhone.

Now everyone can see the coolest goat (Captain Morgan the goat) at the zoo.
Links:
[1] http://www.flickr.com/account
[2] http://www.flickr.com