I donated $20. I wish I could do more, but I really shouldn't right now.
I've wanted to donate for a while, so better late than never I guess.
I'm newer than a lot of people here, and don't post as much as some people (mostly because I know I don't know as much as I'd like to), but I've learned more than I could have imagined since I found this site.
Edit: And through donating I found out I was still signed up for a resume-building site that was charging me $15/mo over the past 4 months. A win for RCF ($20 donation), and a win for me ($15/mo saved).