They are great: just like real cameras for taking pictures, but you get the picture to your PC immediately to play with, none of this developing and then having to scan.
See DigitalCameraSetup for information on getting DigitalCameras working in Linux.
If you'd like a gallery to put your digital photos in then 
Fotopic provides you with 250MB of storage for free! Oh, and they do massive prints and T-shirts from said photos.
Some WLUG people have galleries online:
