If you're browsing the web on a PC, you can just hit CTRL-F or CMD-F and quickly find any text on a webpage. It's great for finding things fast, especially on long reams of text, and Safari does a nice job of it -- just not Mobile Safari on the iPhone, not yet.
Just bookmark this link on your iPhone: Find...
Either bookmark it on your desktop browser and sync it over, or on your iPhone copy the code after the break, bookmark a random page, edit it, change the name, and paste in the code (check the App Advice link above for step
And next time you're on a page, hit the bookmark, type in your text, and find away!
Have an iPhone Pro Tip of you own to share? Send it in!