I just received a 512 MB iPod Shuffle and after having it a week, I can say that, with a few modifications, I would be ready to replace my iPod Mini 4GB with it.
Re-read that last paragraph again. I'll wait. Done? Good.
Now, for those of you who don't know, the iPod Shuffle is a flash based, screen-less version of the iPod. It comes in two sizes: 512 MB & 1GB.
Product Requirements: Device:
Windows 2000 with Service Pack 4 or later or Windows XP Home or Professional with Service Pack 2 or later Mac OS X v10.2.8 or Mac OS X 10.3.4 and later (Mac OS X 10.3.6 or later recommended for use with low-power USB ports)