I always enjoyed playing basketball (even though I'm only 5'6), but haven't been able to play in a long while, since all my friends prefer football (soccer).
Only started watching NBA recently (about 4 months ago), but I only watched one match. They are broadcast pretty late here (after 1am) and end up at around 3 or 4am, so I can't watch the matches because I had to wake up at 7am. Still, I watch the top plays of the day pretty much everyday.
Right now my favourite teams are the Boston Celtics and the San Antonio Spurs. My favourite players are Rondo and Ricky Rubio. In fact, the only full match I've watched was Minnesota Timberwolves against the Mavericks because it was Ricky Rubio's comeback. Basically I enjoy watching players that make great assists and teams with a lot of teamwork.
I don't really follow any other basketball league right now.