I'm on my 4th digital camera having moved up to a Canon DSLR now. You didn't say what type of camera you are looking for (size, $$, what you plan to use it for) because all that makes a difference.
Off the top of my head w/o knowing any of this I'd say stick to Canon, Nikon, and Olympus. I don't know much about Fuji and nothing really wrong with Sony, but I wouldn't have one with the floppy or the mini disk. The floppies don't hold enough information, meaning fewer pics at a time, fewer megapixels which means smaller prints, and the mini-disks take a long time to write to the disk meaning longer between shots. I also don't like the "memory sticks" as it's proprietary and no other camera can use it if you move on to a new camera at some point. I believe they are phasing out "Smart Media" memory cards.
Here's a few websites that offer reviews and you can compare cameras. These are the ones I go to when doing camera research.