Here’s a handy tip! Squidoo lensmaster carriewhite asked in the SquidU forums for a feature to check for dead links on lenses, and thefluffanutta of SquidUtils said there’s a number of free online tools for that.
I tried the W3 Link Checker as Fluff suggested, but its interface is a little intimidating and hard to understand for Jane Average Web User.
After poking around, I would like to recommend the following free tool: iwebtool’s Broken Link Checker.
It limits you to 5 checks an hour unless you’re a paid subscriber. That seems fair enough! The interface is simple: a check means a link is working, a red x means it’s broken.