Diarised

Diarised allows you to schedule events with your friends and/or family in five simple steps: you enter the details of the event; Diarised sends an e-mail invitation to your invitees; the invitees choose the times that suit them best; Diarised will give you a summary of the best dates; and all meeting invitees will be sent an email confirming the chosen date and time.

HiperLink: http://diarised.com/