I still know so very little about the ins and outs of the site's history (that was the one big thing I did learn) so I'm not going to try and explain anything or describe the place (for that sort of thing here are a couple of links - Roman Forum on wikipedia and 'Digital Roman Forum'), rather I'm just going to do the timeless 'slide show' photo dump and let you see some of the same things our photoreceptor faceballs did on the day we visited.
Basilica of Santi Cosma e Damiano
Temple of Julius Caesar
The Forum itself and other surrounding buildings.
The Forum and the surrounding area was very much worth a visit - we didn't even get around half of the overall site and whilst we were there you could even watch the ongoing archaeological efforts in action. If you're into your Roman history I'd say you'd need to give yourself a good day to really take it in. I'd love to go back and see more of it.