You will be! I went from a SP500-UZ to the E-510. It was a bit of a learning curve, but it has been a very enjoyable ride!
For future reference:
http://flickr.com/groups/olympusesystem/
Great active flickr group with lots of good information and helpful people
http://flickr.com/groups/e-510/
Smaller, quieter group for 510/520 but fun to look through the shots
http://forum.fourthirdsphoto.com/
Not to take traffic away from DPS, as it is wonderful for learning how to shoot, but fourthirdsphoto has a sale section with some good prices on gear, as well as a lot of knowledgeable people on the systems. DPS is far better for getting critiques though.
http://www.wrotniak.net/photo/43/
Great site with a ton of information about the cameras, lenses, and getting the settings adjusted for the best shots.