My oldest son is hard wired to find fun things to do with his cell phone. The latest and greatest is Cha Cha. If you have ever found yourself needing an answer to a question RIGHT NOW and your go-to person wasn't available, Cha Cha to the rescue.
To try it out, I sent in a silly question and had a response in less than 2 seconds. A correct response, I might add. It's not mobile search, it's mobile answers, according to the website. Basically, on your cell phone, you send a text message to 242242 and put your question in the body of the text.
The funniest thing we've done with Cha Cha is settle an arguement. It can explain a phrase or quote. You can get current weather stats anywhere. I asked it to find me the closest gas station that was open on a Sunday evening in rural Kansas.
Regular text fees from your carrier apply, but the Cha Cha service is free. I think you can only ask 4 questions every 72 hours. Be sure to check out the website and the Tips & Tricks section. It has shortcuts for jokes, stock quotes, movies etc. Oh, and the confessions page is the great testimonials from other users.
Two other helpful services I have in my cell phone's speed dial list:
Google via text is 466453 ~ I use this when I need an address or phone number and I'm not close to a computer. Much faster than accessing the web via my cell.
Mapquest 1-800-373-3411 - gives you voice activated directions for free (also has a free download for blackberry users - from your blackberry, go to it's web brower and visit m.mq4m.com)