This is really a good read. You may already being doing all of these. Continued At: http://www.searchenginejournal.com/use-twitter-trends-business/105365/
Following trends is useful if you can tie them into your product or service. Trends about flowers for instance will not help a motorcycle blog for instance lol. But if you can tie a hot trend into your niche and make it work, then you're golden.
This reminded me that you can also use twitter to find clients for your services. Just search what your selling and you can find a ton of people talking about it. Then you can send them a private message about your services.