Well, Hubpages really doesn't qualify as "extra money" for me since it's part of the writing that I use to support the family. For writing, I also make money on Yahoo Contributor Network, Epinions and Helium. While Helium gets a lot of bad press, they've made a number of changes that so far seem to be positive, and if you can get custom assignments then the pay is pretty decent. Epinions has decent pay if you stay out of media categories and get a "hat" of some kind (adviser, top reviewer, etc.). Y!CN is by far my favorite and best-paying, but the editorial process is slow and can be discouraging for some. Hubpages is the second best paying for the open-submission stuff :). I also have a number of clients I found on Elance or through referrals, and I've started feeling my way around Cracked and Scripted.
Other than that...I lend money on Prosper, and will eventually get some money back into stocks, ETFs and bonds. My latter, more traditional investments were liquidated for a divorce a few years ago, and the finances have yet to recover enough to put anything back :S.