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