Safari Supports Text Search on iPhone/iPad
Another new and very useful feature of iOS 4.2 is quick search for web pages. If you are looking for a specific word on a web site you are viewing in Safari, simply type it into the standard search field (top right corner). You will get a list of results for the Internet as well as your current page. Scroll down to the end of the list “On This Page” and tap on “Find (whatever your search term is)”. Safari highlights the word in yellow and lets you jump to the next one. Apple gives you all the details in the official iOS 4.2 user guide (PDF download).