I've been furry online since September, and here are some of my favorite things:
1. Art. My favorite I've run into so far has got to be TaniDaReal's stuff.
2. Chat. I spend a little too much time in chat, but it's worth it whether a bunch of light-hearted RP'ing goes on, or I just get to see how some fur's day went.
3. Fursuits. I haven't been around one in person, but watching animated fursuiters on Youtube always makes me smile.