I also like leaving comments on other people's blogs, and they usually reply to me, which is cool.
So, here's the thing - I use an RSS feed to keep track of several blogs. It's a handy, automated way to stay on top of lots of bloggers. But I don't have a good way to keep track of which blogs I left comments on. So I am forced to rely on my memory (yikes!) as to which blogs I need to revisit, to check and see if my comment got a reply.
I know some blogs let you check a box that says "email me about subsequent responses," but many of those blogs get LOTS of comments, and I don't necessarily need to fill up my email box with all of those. Anyone out there have any suggestions?