Can anyone recommend some software for OSX to draw/design schematics and trouble shoot projects before trying to assemble them on a protoboard.
When i did electronics back in highschool many years ago, we used a program called crocodile clips (if anyone knows of it) which from memory was fairly simplistic.
I really wouldn't know where to start looking. What do you use? 
Great apps both of them, and they are free
Thanks for that, fritzing looks good going to have fun with that one
If you literally just want to draw the circuits, rather than create PCBs or anything, then Omnigraffle makes nice looking diagrams.
I did a template library for drawing schematics, which you can download from here:
http://www.arduinoevilgenius.com/Arduino/Downloads.html
Its near the bottom of the page.