Every since I got my Hero a week ago, I didn't see the Text-To-Speech library available on the market. It is the library used by such apps as Voice Caller ID and a ton others.
Well, as of yesterday it's finally available for Android 1.5 users.
If you're curious, see the 2 bug reports here:
Issues - eyes-free - Project Hosting on Google Code - one mine and one someone else's.