Yes, for some reason Microsoft in their wisdom of refining and streamlining IE9 in Windows Phone Mango, removed the "Find on Page" feature aka the ability to find text loaded on the HTML page you were viewing. Obviously this feature is quite useful, especially when trying to locate pertinent information on a lengthy and wordy site.
The good news is Microsoft has heard the complaints, of which we've heard quite a few too, and they do plan to bring back this lil' feature that could. Knowing that IE9 is technically upgradable independently of the OS, Microsoft could theoretically push it out along with some other IE9-updates if they wanted to, but to be honest, we're not holding our breath. Instead, this looks like we'll have to wait six months for "Tango" to hit in order to bring this back. Kind of a shame and hopefully Microsoft won't forget to brink this back.