Shipping advice needed

We have that oh so horrible problem of having too many orders and not enough time to ship them. Business sped up before we had time to learn ways to expedite our shipping and now we are looking for advice.

We used to ship about 30 orders a day and USPS Click and Ship or PayPal Multi-Shipping Tool worked fine, but now that we are shipping 100-130 orders a day we need a new, quicker system. We are downloading modules to speed up printing invoices and to help us click multiple orders over to "shipped" but I am looking for a faster way to print shipping labels and preferable ones with a delivery confirmation.

I have heard of the Pitney Bowes products but don't know much about them.

At this point we only ship USPS, because most of our orders are pretty light and folks like the First Class shipping option.

Does anyone feel like sharing a system that is working well for them?

Thanks a ton for any advice you can give!
Lisa

http://www.zen-cart.com/index.php?main_page=product_contrib_info&products_id=947
http://www.zen-cart.com/index.php?main_page=product_contrib_info&products_id=980
Couple of mods above for printing labels..maybe
others in downloads section

thanks Misty,
These mods may help. We are still searching for the best way to print labels and ship (pitney bowes, paypal multi order etc)....the search continues...
L.