Actually, I think there is an argument to be made for changing the order numbers so it doesn't look like you've JUST opened your store, and the customer is placing order NUMBER ONE!

What I did, is enter a number like 703909 as a starting number. The next order number will be 703910, then 703911, etc. It doesn't then look like you're just starting out. I used 7 for 2007, and 03 to indicate March then just a random number on the end to make it look like I've already processed a lot of orders when, in fact, I'm just starting.

As a reminder, you get to this by going to ADMIN/TOOLS/STORE MANAGER, and then entering a new number in the box called Reset Current Order ID, then click "RESET"