So what do you think are necessary/useful pieces of equipment for an enthusiast/advanced amateure photographer these days?
Maybe we can split it up into classes of photographers.
Ill get it started, but I don't know much about some types of photography so I'm sure I will be corrected.
General -
New Strap (I hate advertising that I have a good camera, give me an inconspicuous one any day)
Landscape-
Wide angle lens, Tripod, CPL, ND Grad filter, remote
Portrait-
Flash, Diffuser
Street -
None? Leica
Macro -
Ring Flash