I decided to try out Pownce. It looks to be pretty good, although signing up with Firefox didn’t seem to want to work – it slowed Firefox to an absolute crawl, and kept telling me my postcode was invalid. (I’m wondering if it was something to do with not having Javascript turned on, although I’d think that’d make it faster?).
Pownce is, in their words, “a way to send stuff to your friends. What kind of stuff? You can send just about anything: music, photos, messages, links, events, and more. You can do it all on our web site, or install our lightweight desktop software that lets you get out of the browser.”
I have 6 invites to give out if anyone wants them… let me know in the comments if you want one (and make sure to leave a valid email address so I can send it to you, obviously!).