Wow..an interesting thread! I'm basically self-employeed (realtor) so the income is sporadic. However I'm pretty good and enjoy being frugal (most of the time) so my spending is under control. However I am far from being debt-free and I look to this forum for inspiration!
I have a couple of ideas for earning extra money:
1) I live in a very touristy town and am thinking of converting part of my house into a vacation rental. If I rent it out 15 days of the month I can bring in about $800. My house is too big for me so it would not be a problem for me to live in just half of it.
2) Being a realtor and seeing all the foreclosures, I see homes left behind with a lot of "stuff"- some worth something, some worth nothing. Usually this stuff ends up in the landfield...My business idea is to get some of this stuff out and sell it to consignment shops/craigslist etc. It would save the stuff from going to the landfield and people would get a good deal on stuff...but is this ethical? Would I be profitting on others' misfortunes?! Hmmmm.