[akkartik]

"Once a week I spend a few minutes looking for new interesting subreddits. http://www.reddit.com/r/newreddits/ helps with that too."

It seems pointless to subscribe to new subreddits since you don't know whether they'll have traction. How can you find 'trending' subreddits?

Or am I thinking about this all wrong?

[chime]

No negatives in adding subreddits that might not gain traction. Sometimes subreddits take a while to attract submitters.

[akkartik]

I'm going to try that, thanks.

[Tautology]

Or if you know exactly what you are looking for you can search subreddits with.

http://www.subreddits.org/