No particular order here
A tripod with out a centre post (this turns it into a mono pod)
A cable release to use with the tripod
A bag
Lens cleaner
A sensor cleaning kit
Photoshop CS3 (Elements will work too)
A
whibal gray card helps, the small pocket one
A
plamp is a help with flower close ups (at the bottom of the linked page)
I’ll stop now and leave room for others to comment
Alistair