Luca, To send a safari page link just click the bookmark + and then send the link using the mail client.
To send a screen shot or a picture (I presume you have a jailbroken iPhone) go to the installer app and then download and install the "Capture" app. It will save any screen shot to your photos on the iphone. You can send by mail from there.
4 and 5 I agree with. 1, 2, 3. It's already partially there.