While I no longer climb I will offer my insights. The best non photo tools are a static line and jumars. It's also worthwhile to invest in a bigwall harness. Hanging around gets old after a while.
As for photo gear my favorite was a 20-35 zoom. Since then the new 17-35 or 18-35 zooms would be great too. Having a wide angle allows you to concentrate on the climber while still keeping his/her position in perspective.