I use TinyTwitter all day, every day! wouldn't be without it ;)

Who uses these? Where do you use them, on your phone, PC, or both? Why do you like them? I use all 3, Pownce pretty much on desktops due to the file-sharing aspect. Twitter I use via SMS and GTalk on my Blackjack and desktops, Jaiku get the m. treatment on my Blackjack, then the main web client on desktops...