iPhoto 7.1.1... PHOTOCAST?

Hello;

I have just signed up for the .MAC service and in one of the tutorials, they show you can "photocast" your albums.

They say to click on SHARE and then PHOTOCAST, it will allow you to choose the quality of the uploading image.

However, my SHARE menu does not have the PHOTOCAST option; it has:
- Send to iWeb
- Web Gallery
- .Mac Slides

Can somebody help me to understand what are those options and how can I upload photos with the highest quality? That the "subscribers" will be notified of a new photo added?

Thanks!