Just to correct some information here...

The ATP Photo Finder logs every five SECONDS, not minutes. It logs faster than the Sony GPS-CS1. Also, you can plug the Photo Finder up via USB cable (same standard cable like the Sony model uses) and access the .log files. Plus, Photo Finder works fine on a Mac (even Intel/Leopard), unlike the Sony. And, to top it all off, the log files are standard, and not the Sonyfied versions the GPS-CS1.

I had to find a replacement for my CS1 when it stopped working with current Mac OS X versions, and the ATP unit was my choice.

Down sides: Mine shuts off too, which is a dealbreaker for me. Also, the backlit display looks pretty, but can't be read in direct sunlight. It would be great if you were using it at night or in dark places, but it seems more folks take pictures in the day than at night.

GPS tagging by memory card takes about 7 seconds a photo, so expect a 1GB card full of photos to take a good long time, and hope the battery doesn't run down during the process or it could possibly corrupt an image (or file system).

Still, a good step forward.