A co-worker just pointed me to this great spyware removal tool: Spybot Search & Destroy. It’s quite comprehensive, and found all sorts of gribbly things on my computers.
A side note: Written by a European, Spybot gives you a choice of languages when starting up. I was surprised to see a white flag with a red cross displayed next to “English”. I’d always seen either the Stars and Stripes or the Union Jack used before. I thought it was a mistake. But Mooney’s Flag Detective set me straight: it’s the flag of England. The Union Jack is the flag of the United Kingdom. You learn something every day!