Minimal Mac is pointing out Cleartones, which offers nice-sounding ringtones for the iPhone. I’ve been using iRingPro for years (here’s my TUAW review). Both companies offer pleasant-sounding tones that won’t cause embarrassment at work or among friends.
They also address my main issue with most ringtones, which is their insistence. So many just sound and sound without pause. The ones I use put a good “seven Mississippi” between tones. I love that.