Once you start using Zoho Invoice, you don't have to go through your notebook to look for contact information for invoicing. Store them here! No more manual searches.
With support for the standard import formats for contacts like CSV & TSV, it's always easier to import rather than tediously enter data anywhere.
You can easily browse through your customers using the links at the left of the page. You can also use the search functionality to quickly narrow down to a particular customer or contact that you are looking for.