DropMocks is a beautifully simple, HTML5-powered photo sharing site
Open your pictures folder, select a few images, and drag them onto a DropMocks tab in a supported browser (Firefox 4 or Chrome 6 or 7). Once the upload is complete, you'll receive a short(ish) URL to share with your friends.
Multiple images are supported as well. Drag in five or six favorites, and DropMocks attaches them all to the same URL.
No account is required to use DropMocks, but if you do want to keep tabs on multiple uploads, all you need to do is sign in with your Google account. It's also totally free to use, at least for the time being.
DropMocks is about as easy as it gets when it comes to sharing photos between your desktop and the Web, and it's well worth adding to your bookmarks. It's certainly earned a place in mine.