I love the book idea! It sounds like a lot of fun! I think I may start a book today.
1) Community Help Desk - I've already used Twitter several
times to investigate an issue I've been having with my
computer, or a problem one of my clients has come across. Just
yesterday I was able to pinpoint the source of a domain redirect
issue because my followers in other countries could reach the
site even though I was being redirected.
2) Write a Collaborative Book - you and a bunch of your favorite
Tweeps could write a novel, one sentence (tweet) at a time. The
results could range from hilarious to Shakespearean. I thought
of this while reading about the popularity of Japanese novels
composed via mobile text messages, but it turns out that some
attempts have been made at this already e.g. 140 Novel
and Good Captain. You could do a similar thing with song lyrics.
3) Live Webinars/Tutorials - you could create a new Twitter
account with protected updates and ask invitation-only
participants to follow you. Then you could hold a *closed*
webinar at a pre-arranged time using Twitter for delivery
instead of expensive webinar solutions. Twitter allows you to
live chat, post links, photos, videos, audio files and text so
there is no need for any plug-ins. You could even use a Twitter
buffer like Twuffer to space out the
content of the webinar via tweets over a specific timeframe.
4) Free Market Research - Who needs to pay expensive market
research companies to learn stuff about your latest product?
Just send a link, a free sample or a short survey to your
followers and watch the feedback flow in.
5) Online Reputation Management - Twitter is ideal for tracking
what people are saying about you, your company or your product.
You can use Twitter Search to enter keywords or hash tags. Or you can use purpose-built widgets such as TweetBeep which work just like Google Alerts and send you regular emails containing any discussions
involving your chosen Twitter accounts or hash tags. These work
well for competitor tracking too.
6) Laugh a Day / Therapy - I'm consistently amazed how many
long-term Twitter users fail to use the favorites option to
bookmark tweets that they like. Whenever I read a tweet that
makes me laugh out loud, I favorite it immediately. Then,
whenever I am feeling a bit flat, stressed or sense a bad mood
coming on, I turn to my favorites list knowing I will be
giggling in no time. You can also rely on your followers to
sense when you're down and cheer you up.
7) Competitions - Companies like Zappos and Hand Bag Heaven
have been holding competitions on Twitter for a while now. You
basically elicit a response from your followers in exchange for
the chance to win something. You could ask a question about one
of your products or ask followers to find something on your site
to win a gift certificate. But with a bit of ingenuity, you can
be even more inventive.