After a failed attempt at starting an internet gaming company (thanks Stock Market Crash), I joined forces with 2 others to start Clicktools.
Clicktools was one of the 1st SaaS companies in the UK, the 1st European ISV partner of Salesforce.com and one of the first 25 apps on the AppExchange. Clicktools was bootstrapped to over 50 people with offices in the UK and USA, part-acquired by Survey Monkey before being fully acquired by Callidus (now part of SAP).