Oh thanks for that, that's a nice one. As long as you brought this post back up top, let me also put in a plug for the Screaming Frog SEO spider. Someone up there ^^ mentioned it already, but it's at [screamingfrog.co.uk...]
This tool quickly went from being my favorite new toy to an absolutely essential how-did-I-ever-live-without necessity. I just wish I'd had it when I was doing some site migrations in previous years. It'll give you response codes for internal and external links, page titles, meta descriptions, h1-h5 tags on pages, and all can be exported to Excel. And it's way fast without putting too much of a load on the server. Well worth the money (which is 99£ per year; not sure what the exchange rate is right now) Recommend!