Income on the Side? 
akamaka: Freelance sysadmin and web development work brings in a bit of money.  I've never gone out and looked for this type of work, but I've gotten to know a handful of good clients over the years.I do the work more because I like them than for the money, and I'd still help them out if I was rich enough not to work, but getting work from them has really helped when money is tight.