Does the iPhone support bookmarklets?
Bookmarklets can provide useful functionalities such as finding text within a page, quick searching Wikipedia, excerpting all the links from a page, finding similar websites to the one you are browsing, looking up movie times, and more. There is practically and endless list of bookmarklets available for your utility.
To take advantage of bookmarklets on your iPhone, add them to your bookmarks on your PC that you sync with the iPhone. Then, sync your bookmarks to your iPhone, and you can access and utilize your bookmarklets from your iPhone's Safari bookmarks.