Reflecting, there's more I've failed at. Regrets are easy to have, and I certainly have 13 years of Catholic education to thank for my ability to feel guilty, too.
I said after I sold my house that I'd start volunteering with an organization that rehabilitated houses. Hopefully in the spring I'll schedule that in, and make it happen. Hasn't happened, yet. I'm hoping perhaps to interest some of the other members of HackPittsburgh in joining me at least once, as the more people you have, the more you can get done... at least if you're organized.
Similar, but different, I swore I'd make more of an effort to enjoy life, lest I approach the misery I've had before. I've done reasonably, but sometimes I miss. Biking, for example, I find therapeutic. In spite of that, I had fewer 20 miles rides this year than last, and most of those were the 20 miles I can pretty much stumble out the door onto. I've done more biking-as-transportation than ever before, at least.
I also failed at getting out as much as I'd like for railroad photography, but in some way that's constrained by my inability to find others available for it, and my lack of desire to sit in a car in the middle of nowhere by myself for the more interesting things I might see; I could, again, take the pictures in stumbling distance, but largely, I have, and it's old-hat.
2010, like each year before it, offers an excuse to try to "do it better". Here's hoping that I will.