Wiredness is a new Web-based photo-editing tool. There are a ton of these out there now, and they just keep getting closer in functionality to their desktop counterparts. What makes Wiredness easy to use is its interface, which has file, edit, and tool menus you'd find on a desktop app like Picasa or Photoshop Elements.
For casual photo work flow, you can either upload a photo from your hard drive or pull it in from a URL. The max size for files is 5MB. The service handled my 7.2-megapixel test photo without a problem. There are tools for resizing, rotating, brightness, and contrast, along with some Photoshop-esque filters. The resize tool is probably the one "wow" tool, as you have an option to select exact specifications or use an easy slider that will show you a live preview of how big the image will be. It's total eye candy.
There's no service integration with sites such as Flickr or Photobucket for ferrying photos back and forth, but you do have the option to output any image to ImageShack or Glowfoto with zero configuration, which is good for quick sharing with family members.
Admittedly this service is young and missing some of the features you'd find on a competitors such as Picnik, Fauxto, SnipShot, or Pixenate. The key difference is that all those photo tools run in Flash and require users to install the Flash plug-in on their browsers. Wiredness and Phixr (which we looked at on Monday) are both managed with HTML and will work with any browser right out of the box.
One thing to keep in mind with many of these services is that they're not aimed at professional photographers. What they are good for is making quick edits and tweaks to photos while away from your home machine.