I ran across tumblelogs a couple of weeks ago and it’s an excellent concept. Its like “mini-blogging”, you post IM conversations, quotes, links and random commentary. It probably lies somewhere between Twitter and actual blogging (Robert Scoble are you listening? ).
I’ve started a Tumble log using Tumblr’s free service at rushi.tumblr.com and posting is soo simple. All done through a simple bookmark. Give it a shot, it’s awesome.