100 Tips to Be a Smarter, Better Twitterer is a useful resource for any business considering Twitter as part of their marketing plan.

Here is an excerpt focused on those tips most applicable to the unique requirements of professional service firms:

• Twitter about your blog, but go beyond it as well
• Let people know about your achievements-shows, interviews, big trips.
• Found something interesting, useful, or funny? Share it with your Twitter network.
• Twitter loves photos, videos, and more, so share good multimedia.
• Update at least once a day so your followers have something to follow along with.
• Help others out, and ask for their opinions to improve relationships.
• Share your knowledge and give people a reason to listen when you tweet.
• If someone you’re following offers valuable information, retweet it, and you can simultaneously share it with more people and show the person you retweeted that you appreciate them.
• Connect with colleagues, journalists, competitors, and people who love your brand.
• Engage with those who engage you-and don’t be afraid to start conversations.

Beyond marketing your professional services firm, Twitter can also be a valuable window into the thoughts of your desired target audience as well as a resource for new ideas relevant to the development of your firm.

h/t: follow http://twitter.com/RobertWHughes and http://twitter.com/ExpertPersuader