Originally Posted by RinR

For the Colosseo, purchase your tickets at either the Forum gate or the Palatine Hill entrance. The ticket is good at all three locations... Read this to get more info on discounted tickets in Rome and the way to bypass the line at the Colosseo.

As far as the Galleria Borghese, make a reservation using their new call back feature - it will not cost you a cent. If you're in town for a few days, the Roma Pass can you into both free! For more info the Galleria, Read this!

Good Luck!
Ron in Rome