I'll do my monthly update a few days early this month. I've calculated out most of the monthly summary data already. Over the next few days I'm planning a "year in review" and also a "2014 plans" update.
First, hard data. This was hands-down my worst month of expenses over the past few years (excluding travel months). I'm not concerned about it, but there it is. I spent roughly $2500. An enormous amount of that was 'social spending.' Either going out with friends, dating, or buying gifts. Here are some of the unusual expenses:
* $250 (!) to go to a concert with a friend. I wasn't all that interested in the concert, but ended up having a good time. This is my oldest friend, someone I grew up with, he's having a kid, and he's always wanted to see this performer. So it was sort of a Christmas gift to go with him.
* $100 for Christmas gifts.
* $300 for dating (concert, dinners, etc).
Besides, that, expenses were actually pretty minimal. I spent $160 on food, $60 on entertainment, $40 on hobby stuff, $90 on subway tickets, $60 on utilities, $1225 on housing, and other small miscellaneous expenses.
As for income, this was my biggest dividend month yet: $836. A lot of that is simply companies timing their dividends to fall on this month. Also I've been investing most in Vanguard funds that pay out in December. But I also saw my average expected monthly dividend income rise $14/month from re-investment and adding more money to investments. I really need to be more aggressive with purchases, but it's a start.
My net worth went up $15k this month. Mostly because I shifted 80% of my income into my 401k to max out company match! I like having that flexibility. January I'll have more sane numbers.
As I mentioned, I got a bit more serious with the dating. I've met someone who I really like, though it's still too early to say much. This led to an increase in expenses, but I don't mind. I think that will settle down a little, as I can focus on more creative and personal dates. Perhaps that's foolish of me to expect

Charity
Charity was pretty much steady this month. I signed up to volunteer at an event in February, and I've continued my regularly scheduled donations. $100/month to Kiva (as well as redonations). $30/month to a few impoverished child charities. And using the One Today app on my phone to pick out a charity to donate $1 to each day (usually environmental charities). In a few months I'll really focus on volunteering more, but I'm happy with this for now.
Guitar
I'm really happy with this. I've been steadily practicng 1/hour per day. Sure, I miss a few days but I've seen good progress. It may be, at just a month in, that I've worked harder at this than any other personal project in my life! Which is pretty sad, but most of my accomplishments have been "institutional:" sign up for a club, and always show up. Or start working, and keep going. This is something that's just me.
I'm still very bad, but I've seen enormous improvements. Every 10 hours of practice I buy a few small treats for myself: some songs in Rocksmith, new guitar picks, or recently I bought a slide, which is fun to play with. At 100 hours of total practice I've selected an electric guitar as a reward/goal. That's about 2 months of work away.
Fitness
I really slipped on this. I lifted a few times and then I really had some bad pain in my ankle, of all places. I think I got too aggressive, too soon after the marathon. I eased off and stopped workout out entirely, which was probably a smart move, but it was also disappointing. I'm hoping to ease back into this, starting today. January I really want to be back on track and lifting again.
Job
I think the first phase of a new job is complete, I'm working on a larger project now. I'm getting familiar with Java, and now it's time to start digging into Javascript. I'm getting a bit bored, or suffering with some of my old motivation problems. Focusing is a bit tricky. But I think I'll be able to adjust and really dig in. There's a lot of interesting work to be done. And of course, the food is great and I'm enjoying playing ping-pong.
I've been reading a lot about skill acquisition and talent, and I'm hoping to apply some of that to programming. I have some ideas which I'd like to try out to facilitate learning new programming skills, which could also yield some productive side-projects.
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Overall, December was a good month. I'm most proud of my work with guitar. Everything else is mostly steady progress, which is fine as far as I'm concerned. One month isn't a very long time so incremental improvement is key. Stay tuned, if you care, for a review of 2013 and my goals for 2014.