Unsure of your space limitations or functionality you are looking for, but I'd suggest a trash pull out, and a set of good sized drawers. If you are looking for an open shelving type, possibly roll around island, I'd suggest a good sized drawer and shelves with raised edges all around...so many options, do you have any sizing or option preferences?

You can find some inspiration here on Hometalk. I know AK has doen some great islands, like these - http://www.hometalk.com/activity/89691

You can also search posts for islands at the top of the page for more suggestions. Hard to say much more without more specific info. Good luck.

Some place in the Caribbean... and make it hard for others to get there... ;-)

Also, just flipped through my Nov/Dec This Old House, and there is all sorts of great info in there about kitchen islands.