You can safely drop these 3 if you're using v1.5.4:
customers_wishlist -- might have been from an old version of ZC. Or a plugin if you've created one.
linkpoint_api - used only if you're utilizing the Linkpoint_API payment module
nochex_apc_transactions -- used only if you're using the NoChex payment module

If you're not using these plugins, you can drop these tables:
customers_admin_notes -- is created by the Admin Notes plugin
vouchers -- no idea ... presumably a plugin?