Jott (1-866-JOTT-123) has added a silly new feature: when it asks "who do you want to send a Jott to?" say "8-ball" and the thing will answer your question like a Magic 8-Ball.
Used it's "real" way, I've found Jott to be an incredibly useful tool for sending myself reminders: send a Jott to "myself" then speak a short message — they turn it into text and e-mail it to you. You can also post to your blog using the service, but I don't think I'll be trying that until they can guarantee perfect transcriptions.
Another cool new feature: you can create a Google Calendar event in a single step using Jott. Just call Jott, say “Google Calendar”, and then the time of the event and what it’s about. They'll take your voice, convert it to text, and insert it into your calendar for you.