There's now a comments link for each blog entry. This wasn't the original design, but it was the only one that came out to be technically feasible.
The original idea was to have a textbox below each blog post with a "comment" button, so you could simply type in your comment and it would automatically go to Blogger. The Blogger API has the facility to do this, but only in a very limited way:
The Javascript library (and I believe all of the REST API for creating blog comments) requires a user to be logged in. Which means that to comment, you would have to have a Google account and give my site permission to do things on your behalf (namely, create comments). But it could only create comments on blogs of the signed-in user, so I'd have to setup the service to sign me in every time. And then, even when trying that for a "this is a horrible way to do things, but let me just see it work" approach, the mere fact that I had granted my site access caused something in the google script to go into an infinite loop.
I tried giving Google's interactive Javascript API tutorial a try with this whole creating comments thing, and had the same infinite-loop experience. So I abandoned the smooth Web 2.0 style commenting. And now you have links directly to Blogger for all your commenting needs.
At some point, I'll make these links load in an iframe or something so you don't have to wait for my page to re-load when you go back to it.
And, as a bonus: Permalinks!