I recently attended the LIFT Summit in Atlanta and heard a lot of good speakers from the social arena. One of the things I took from this meeting was a better understanding of the uses of Twitter for B2B companies. Some of the better uses of Twitter for B2B are:
Recruitment: Use of Twitter for recruitment is a definite possibility for corporate employers. Both in prospecting and in research of candidates' activities online.
Customer Service: Communicate with your followers/customers about things like service outages, updates, new offerings and assorted customer service issues.
Partnerships: Find potential partners for your business on Twitter. Oftentimes they are Tweeting about complimentary, non-competitive services and products they offer and the best thing about this is that, if they target the same market that you do, then potential partnerships can be on the table by reaching out to them.
Marketing: Getting your brand out there to be seen is of vital importance and Twitter is one more way to do so. Make sure your messages are valuable to your followers, not just "cool" to you as the marketer.
Monitoring: Being able to keep an ear to the streets on what your clients are saying about you is very valuable if you monitor this activity closely. You don't have to have a Twitter account to find out what's being said about your company.