This is basically an online scrap book. When I am trawling the web doing research for an upcoming design project (pretty much every day) I often find cool images and links that I want to remember without taking up room on my hard drive.
I also use it to store images, recipes, quotes, lyrics, music & videos that I find inspiring (for whatever reason).. I also put up some of my own work i.e. music, graphics, lyrics, random thoughts e.t.c.
Everyone should have a Tumblr blog. Its good for the soul! Feel free to flick through my ipod below... I update it regularly so check back and spend some time roaming about my head space... Enjoy!