anybody there?

We got a new computer, a MacBook that I love. But I need to get a photo editing program for it and I don't know which one to pick. Any advice? I'm used to photoshop on my pc but I'm willing to try something new. I do love photoshop though...and I don't know if this old dog has any new tricks in her.
Just a few from what was on my camera. Graham in the chair at Fairytale town. The rest are from our trip to San Francisco a few weeks ago.