Uploading photos from iPhoto to a particular website can be a bit tricky. However, certain sites like Kodak Gallery have specific iPhoto plugins that allow you to upload photos straight to your account from within iPhoto.
To install these plugins, quit iPhoto and run the downloaded installer as if you were installing any other application. The plugin will appear in iPhoto when you reopen it (usually in the export window as a new tab for that site).
Typically, you select the photos you want to upload, go to “File-Export". Choose the tab for the site, and enter the requested account information. Click “Export" or “Upload" and of the images go to your account.
Here’s a list of iPhoto plugins you might be interested in:
The links below go to the company’s download page, which includes directions for their specific plugin.
Kodak Gallery (formerly Ofoto): KODAK Gallery Upload Plug-in Software
Flickr: Connected Flow - FlickrExport for iPhoto
Shutterfly: Shutterfly | Free software | Upload Features for Mac
Costco: (Yes, even Costco supports iPhoto. You have to be a Costco member to access this download)Costco Photo Center - Account
Picasa: Picasa Web Albums Picassa is Google's online photo gallery. They even have the Picasa software now available for use on the Mac. It is very similar to iPhoto. If you want a free alternative to iPhoto you might want to check it out. You can find the link here http://picasa.google.com/mac/.
Want an all-in-one solution? While searching for links to the above plugins I discovered something called Pixelpipe. Pixelpipe allows you to upload photos to over 80 differents sites, including most of those mentioned above. Pixelpipe - Pixelpipe on your desktop Pixelpipe does not support iPhoto ’09, but if you have an older iPhoto tou might want to check this out.
There you go. Yet another way to use iPhoto to share your photos with the world.