I always wanted comments in my Tumblr account. It's not like I get a ton of comments, but I've always felt that things posted especially on blogs should be open for conversation.
Thanks to the guys again at Disqus, my mobile site is now interactive. I cannot recommend them enough for updating and organizing comments and for creating a community out of that interaction.
www.disqus.com - Disqus
http://ping.fm/nGdiO - My Mobile Blog