Ipartee is not a new startup. but they recently did a update to offer a Widget version of their service and the idea it is enticing,the model of the idea could be pretty much compared to a widget ad and the press kit in widget form. just take that form and refocus it for events and that is exactly what the ipartee widget offers, a way to share the information about a even before the even happens and that can be updated to reflect what happened at the event once it is finished, so you could share part of the experience of what the event was because people can leave comments about it, you can upload notes and photos as a recollection of it.
pretty simple. we have seen lots of widgets like these but the refocusing of the form thanks to the idea and the fact that it is a extension of a service is what makes it useful and valid.
The only thing i would want is if they offered a Flash or Silverlight Version of it instead of just a Script version, this is a widget that could be very easily used in Social networks like myspace and beyond.