I'm mostly retired for the last 4 years but I'm still a telecommuting independent contractor and I charge $100 an hour with a four hour minimum. I've also been known to work for free on interesting and worthy (non-profit) projects.
I usually get paid for coding JavaScript/HTML/CSS and whatever Perl happens to be gluing it all together. Typically, I'll administer and secure the server(s) and be on call for emergencies. A lot of times I work with smaller shops where I "get " to play at DBA and whatever else they don't know how to do.
Now, I'm not a greedy man and I would be happy at $50 or even $25 an hour but I found two things happened when I went to $100/hr: more people hired me and I only got serious customers. Life has been much more pleasant since then.