here is mine
bMethe | Tumblr
To like it you just click the heart in the upper right of the post. To comment you have to reblog the post and add your own remark...I think.
Most Tumblr themes (or all?) have an option to turn on Disqus, which allows people to post comments. I don't use it and I'm not really sure how it works (whether someone has to be a member of tumblr or disqus or whatever to comment).
yeah big fan of the tumblr deal. i can spend hours on that thing. and interestingly enough in the past 2 weeks i have acquired a large following of whips and chains type homosexuals. i'm not trying to be crass or anything but it's true.