Maintaining my mojo

This year I've lost 15kg - started out at 91kg - the first half I lost when I joined the gym again, the second half doing weight watchers online. WW has been pretty easy, but the tools are frustrating, lots of foods missing, access is crap, and it costs $40 a month. Then a friend put me on to MFP and here i am. Just in time for the crazy eating season, was worried about ditching my WW membership and piling it all back on (I'm a yo-yo-er from way back). But I think I've cracked it now - exercise every day, track every mouthful and don't deprive myself.

So far I've been using the food and exercise trackers, and found a few friends, but lots left to explore I presume. What are some of the good features?