Hey Burgo - you should get a red "notification" box up in the top right.
However alternatively, just hover over "Friends" and click 'Incoming Friend Requests'.
I'm guessing you figured it out now though, as you've friended some people, haha
Thanks for the support from the FS community so far - send in some feedback if you have any as we prepare to start marketing it once we're happy with the system.
The latest improvement is the Wall, makes it a lot more interactive.