The E20 is a bada**. I considered it when looking at the 5700. It does cost a little more though, and so I figured I might as well just get a digital SLR for the money.
I consider this heavily when looking into a camera: I didnt want to go into it before, but it looks like the discussion in unavoidable: WHEN LOOKING AT A CAMERA, CONSIDER THE MANUFACTURER'S HISTORY.
There are two main classes of digital camera. The traditional camera companies that are branching into digital. These companies, such as CANON, NIKON, FUJI, OLYMPUS, MINOLTA, are well known for certain types of cameras they have always made. This influences heavily what their digital camera line will be. Canon has built a rep on making consumer level...and so they make the best in that category of digital camera for general consumers...from the G3 to the D1s (the $9000 bad boy). Minolta has made great focus systems. I chose Nikon, because 90% of professionals use Nikon body's. Nikon has the ED lenses which are known to be the best made (the 5700 is the only digital cam with ED lenses on it, previously only available as an add-on lens for a SLR starting at $1500 for just the lens!!). On and on...
Then there are the electronics companies. SONY, HP, etc. These companies dont have alot of traditional camera technology to bring to the table, but bring their electronic know-how into the game. They may not have the best optics, but easier menus, better compatibility, more options, etc.
Think about what you want in a digital camera to guide you. If you want a good Point&Shoot, that has been olympus's strength. If you want the best lenses, nikon is prolly the best. If you want ease of use, sony does it the best. Bottom line is, if you want a camera that you can manually adjust everything, dont get an olympus, chances are it wont have the white-balance controls that a nikon would.