Hey! I just took a look at your channel Feathers (because I'm nosey) and it looks really good, so I subscribed. I can't imagine you'll have trouble growing it.
I only have around 80 subscribers at the moment, but I'm always interested in hearing the ways other people help their channels to grow so thought I'd put in my bit! Whenever I upload a video I tweet it out, share it on Tumblr, StumbleUpon and Google+. I don't know how much this does, but I do know it sends a little bit of traffic to the videos. I also try and comment on other people's videos and get conversations going; again, I don't know how many people would see my comment and then head on over and watch a video, but it's doing no harm.
Has anyone tried AdWords for their videos? I know it's a pretty guaranteed way to get the view count up (though I doubt it does much for watch time overall, but a video that shows as having more views is more likely to attract new viewers I guess) but is it a beneficial way to get subscribers?