Well, around my friends, it's a hit. 🙂 Front Row is probably the most "ooh-ahh" thing, along with Dashboard. The whole experience (Dock, Exposé, "Cool AIM" or iChat, etc.) really gets them though. Every one of my friends wants a Mac (from seeing mine and listening to me) and are attempting to convince their parents to get one as the next computer.
Around adults, it either goes unnoticed or extremely praised. 🙂 My dad's friend works for an ISP, I think, and his first reaction on seeing the iMac was "They are so much better than PCs".