Scroll down in Safari on iPhone/iPad?
There is no keypress or gesture to do this unfortunately.

But here is a quick way to achieve a similar thing.  


Create a new bookmark in safari (of any web page)
Edit this bookmark (press edit in bookmark screen)
Rename the bookmark to End
In the address field cut and paste this text 

javascript:scroll(0,document.getElementsByTagName( 'body')%5B0%5D.scrollHeight);



Once you save this bookmark, you will be able to hit the bookmark button, select End and it will take you to the bottom of the web page.  I know it's not as simple as the current scroll to top feature (this solution requires two taps), but its really the only option at the moment.