The Red Ferret Journal points out a slick, Japanese upload-and-convert tool for giving photos that browned-out, decades-old look. Select a photo or paste in a URL (both words are written in English, as luck would have it), and hit the bottom blue button. The photo results aren't returned at full resolution, but, depending on lighting, quality, and, of course, modernity of subject, you can get pretty authentic-looking results without any image editor filters or plug-ins. The site is free to use, and (it appears) doesn't restrict upload file sizes. Wanokoto

Linux only: Flickrfs makes uploading to, downloading from, and organizing a Flickr account just like handling files in a mounted file system. After installing and setting up the link to your account, you can see all your photos separated into tag folders, edit and back up the pics and their metadata, and crop and resize photos on the fly, all reflected in realtime in your online account. The tool works mostly through your native file browser and the command line, but the program's author has created a visual desktop Flickr organizer that links into his app. Flickrfs is a free download for Linux systems only; Step-by-step instructions on setting up the dependencies and the program itself available at the project's home page. Photo by myrtti.

The Digital Photography School blog has a great beginner's guide to capturing an effect familiar to fans of middle-brow films and photo exhibits—light trails. Any camera with a full-featured "manual" mode that grants exposure control can capture light movement, and the guide helps you plan good trail shots. For instance:
Timing/Light - One might think that the middle of the night is the best time for light trail photography (and it can be) - however one very effective time to do it is just as the sun is going down (just before and after). If you shoot at this time you'll not only capture light from cars, but ambient light in the sky which can add atmosphere to your shots.With a little practice (and a healthy dose of patience), your street and nightlife photos will stand out. Photo by Waka Jawaka.
How to Shoot Light Trails

There is, to be sure, no lack of online image editors, but most are helpful only if you trust your instincts when it comes to lighting, sharpness, color balance and all the other tools of the digital image trade. Free web app ImproveYourImages.com is like a web version of Picasa's "I'm Feeling Lucky" button. Upload your image, check out the improvements, and download the corrected version. I had to scale down and set one of my digital camera pics to 72 DPI before it would take it, but not being all that proficient in Photoshop/GIMP, I'm happier with the results than I would have been trying to tweak it myself.
ImproveYourImages.com