I work from home as a software developer and, as a result, I have a flexible schedule and a few hours of downtime each day. I've been thinking it would be nice to earn a little extra money, especially since I could do things while other people need to be at the office / commuting / preparing for work. The two things that jump out at me are driveway snow removal and dog walking - are there any other part-time, casual jobs that people can do while working from home?
Last I checked, software authoring was pretty lucrative. Are you specifically looking to do some non-software work? The two things you mention are among the unskilled work o go after, but with some effort you might be able to use your skills to pick up other work. As a blogger, I've needed help with PHP and the blogging tools, the rate for help was $50/hr. Snow is too seasonal, but the walking surely doesn't pay that much, or does it?