Those businesses that ship physical products will notice that Infusionsoft does not currently provide a way to batch print invoices to be used as packing slips or invoices.
Attached to this post is a .zip file that contains a PHP script that will use the API to pull all of your recent invoices and allow you to click "print" once to print them all on separate pages.
This should save some businesses a TON of time, or allow them to do something they weren't doing becaue it was too painful.
Please read the README.txt file inside the .zip file before doing anything else.
If you'd like to test this out,
go here.
Good luck.
I removed the file because I've updated the script since I first posted this.
You can find it here.