Modified Today?

Does anybody know of either a hack or a plugin that will allow me to call out any post that was modified today? For example: I modify a post today, and on my blog it looks different (e.g. via CSS) from any other post in the list. At 12:01AM the next day, the condition no longer applies, so the styling reverts back to the standard styling.

I checked the documentation on Conditional Tags, but could not find anything that would analyze the modified date and respond to it.

Thanks in advance!