The best piece of professional advice I've had in 2013 is from my colleague Katharine O'Moore-Klopf in her recent blog entry The 1.5-Hour Daily Social Media Schedule, where she advocates regular link checking.
Katharine's advice to do this regularly is crucial if you have a website that has many links embedded – a blog or a resource centre, perhaps. Not keeping on top of link integrity can mean things get out of hand. The Proofreader's Parlour is a case in point. It's been live for a year and I've not run link-checking software on it. The result is that there are a staggering 239 broken links on the site.
This free online link checker will do the job: BrokenLinkCheck. Below is a summary of this tool's key features but there's a super article on the site that's worth a read, too.
Summary of features (as quoted on the BrokenLinkCheck website):
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