We've just seen a great demonstration of hootsuite.com, a clever dashboard that enables you to link tweets with status updates on LinkedIn and updates on Facebook. Write it once and then decide where you want it published.
What's really handy is that you can manage multiple accounts, so it's possible to run client feeds from one place. All free at the moment, unless you need a real enterprise version.
This little gem came from an excellent social media course run by www.businesstrainingmadesimple.co.uk, highly recommended.