Because we talked about this, I've been observing it, and I am definitively on one side of the fence now. The host and publishing platform I use for my site has always been on the leading edge of its SEO readiness, and I just noticed that they were adding the trailing slash to all our pages now.
I went to a blog that started a long time ago and noticed that she doesn't have them...but she has 1.5million Twitter followers so I'm sure she's not worried about SEO
Someone who would be up to speed on SEO and implement new changes would be AListApart.com and they are using the trailing slash. I lean toward emulating those that are dominating their field, so I would go with the trailing slash. If it doesn't matter, it doesn't matter. If it does, you've got it there