Manicai.net
This page lists various random scripts I've put together at some point for some project that might be useful. Quality and flexibility is quite variable. If they're useful too you then great.
GetStock: a Perl script for grabbing stock market prices from Yahoo! as CSV. Designed to get lots of stocks from a fixed period of time.
Mortgages in Excel: When I was buying a house I found lots of mortgage repayment calculators on the web but general it was hard to see what the effect of different interest rates, overpayments, or loan periods was. So I knocked up this sheet to help.