Thanks for the kind words, everyone!
As to how I have been doing it - nothing fancy. Eating good foods in moderate amounts. Keeping myself in a moderate calorie deficit (average around 1000kcal deficit each day - I try to eat as much as I can and still lose weight at a good rate). Trying to increase healthy proteins and reduce unhealthy fats. Cutting out soda and potato chips entirely, and eating a lot less junk and fast food overall.
Exercise - try to work out 6 days a week if possible. Started out just walking, then added light weights. Then added swimming and regular strength training at the gym. Some running - I did a 10k in September. I like to alternate cardio and strength days but I don't follow any sort of rigid schedule, except that I don't do weights two days in a row.
Spark and Nik - don't be fooled by that one shot - I'm flexing there to ham it up a bit.
However, the core of my weight routine is compound lifts. I start with squats, and then bench press, shoulder press, inverted rows and deadlifts. Other stuff I fill in at a whim, but usually includes rows, pullovers, lat pulls, tricep press, pec-dec, that sort of thing. My weight sessions are usually just under an hour, plus stretching and warm-up/cool-down. I do 5 sets of 5 reps for whatever lift I am doing.
Cardio days are based around swimming, but that is subject to the vagaries of my shiftwork vs pool hours. When I swim I now go for an hour if possible, which for me at the slow rate I buffalo my way through the water is about 1500 metres. When not swimming I walk (and took up trying to run for 3 weeks when the pool was closed), and during the winter I will be using my nordictrack a lot, I think.
Started to blather on a bit there, but that's pretty much my methodology. I hope to ride it for another 50 pounds or so, and then focus on building strength and muscle mass.