OK I missed this some how, but one of my favourite tools for web development and SEO work Xenu Link Checker was updated last month. A new version of Xenu Link Checker 1.2i was released
I love this tool first from a web development stand point as it allows me to quickly test a large site for broken links. I've yet to find a better tool.
From an SEO stand point, I use it much the same way, but this time as a bot/spider emulation. It allows me to view the sites linking architecture (site architecture) backwards. If there is a specific page that I'm trying to get ranked high in the search engines, then I run Xenu and make sure, first the page gets found. Secondly I can reference all pages that link to the page. I can then evaluate if the page needs more internal links or perhaps to be relocated within the sites architecture.
Either way this is an extremely useful tool for the SEO & Web Developer tool box.
A download of Xenu can be obtained at http://home.snafu.de/tilman/xenulink.html