This is why I love subscribing to SaaS services - new features, no extra cost!  Harvest just made a free update to their invoicing service so that "Harvesters" (you know, people who use Harvest for their time tracking and stuff - yeah, I just made it up) can get paid even if their client is on holiday - no more excuses to delay, lovely!

This is what the internet is all about.  Keep up the great work guys.

Say Hello to Getting Paid on the Fly | HARVEST Time Tracking and Invoicing Blog.