I am a firm believer in the policy that one should "know" a few powerful tools (doesn't matter their age) very well rather than messing around with a whole bunch of tools which change with time/fads. Spreadsheets are a great "power tool" in the right hands and since i have never really explored them, your comment was intriguing to me. It would be great if you could do a complete write-up on your website/blog and submit to HN so everybody can benefit from it.