Congrats on the purchase guys
Midas, wait until you try the lens at the airport, thats when you get to see the real quality of the lens. Try not to photograph during the midday sun though, thats when heat haze is at it's maximum and often makes photos look soft.
Cardboard, I presume the 70-300mm lens you bought was the Olympus 70-300mm f4-5.6 Zuiko Digital ED Lens?
It seems the Olympus cameras have a 2x crop factor meaning the 35mm (film) equivalent length is 140-600mm!
The Canon users have a crop factor of 1.6x on their cameras so a 70-300mm lens mounted on their camera only has a 35mm (film) equivalent length of 112-480mm!
The Nikon cameras have 1.5x crop factor meaning a 70-300mm lens on a Nikon camera has the 35mm (film) equivalent length of 105-460mm!
Simplifying all of the above, you have quite a bit more focus length than the rest of us guys

Even the guys with Canon 100-400mm lenses only have a range of (1.6 x 400mm) 640mm.