Here are some things I have been thinking about:

(pardon my caps I have this ins a text file and it was easier to see that way)

IF CART HAS X dollar AMOUNT IN THE CART THEN Y INSURANCE FEE APPLIES (THIS COVERS ANY EXTRA FEES FED EX CHARGES SHIPPERS) 

SHOULD ALSO HAVE A OPTION IN CHECKOUT THAT IF CART HAS X AMOUNT OF DOLLARS IN IT YOU MUST CHOOSE A BOX THAT CHARGES THEM $2 SIGNATURE FEE JUST LIKE FED EX CHARGES SHIPPERS

CUSTOM DATA EXPORT UNDER ORDERS SHOULD INCLUDE BUYER E-MAIL

ABILITY TO SET FLAT RATE SHIPPING ITEMS

EASIER CROSS SELLING OPTIONS (A WIZARD WOULD BE AWESOME) 

HAVE INSURANCE OPTION WITH DOLLAR AMOUNT IN CHECKOUT

THE "FREE SHIPPING" SHOULD STILL BE ABLE TO PROVIDE SHIP TO ADDRESS & SHOULD NOT DISPLAY "NO SHIPPING REQUIRED FOR THIS ORDER" ON THE INVOICE

FREE SHIPPING SHOULD NOT BE AVAILABLE ON INTERNATIONAL ORDERS

SEPERATE MAX WEIGHT PER PACKAGE FOR INTERNATIONAL ORDERS

CLICK TO VIEW INVOICE button SHOULD BRING UP INVOICE NOT another OPTION TO VIEW EITHER INVOICE OR PACKING SLIP (MINOR BUT IT IS A PAIN)

WHEN YOU EDIT AN ORDER AND CHECK REAL TIME RATES IT ONLY RETURNS GROUND RATES there are no fed ex HOME DELIVERY RATES (SHOULD BE FIXED)

ON modPrdb.asp HAVE A LINK TO: srcPrda.asp?ac=newsearch

free domestic shipping option only should be able to block international ORDERS (WE CANCEL SO MANY OF THOSE ORDERS BECAUSE IT LETS THEM PROCESS THE ORDER)

IF POSSIBLE BLOCK THE WORDS PO BOX AND POB AND APO FROM THE SHIPPING ADDRESS IF THEY CHOOSE FED EX OR UPS SERVICES 

WHEN USING A GIFT CERTIFICATE SHIPPING CHARGES SHOULD BE ABLE TO BE DEDUCTED FROM THE GIFT CERTIFICATE

Allow CUSTOM DATA EXPORT OF JUST CERTAIN CATOGERY NOT ALL ITEMS (OUR DATABASE IS GETTING TOO BIG)

INTERGRATE WITH PAYPAL TO KNOW IF IT IS CONFIRMED ADDRESS (SO I KNOW IF I'M COVERED UNDER THERE PROTECTION OR NOT)

SPECIAL PRIORITY E-MAIL IF I GET AN ORDER THAT HAS EXPRESS SHIPPING(THAT WAY THOSE E-MAILS GET TO US FASTER AND I KNOW RIGHT AWAY IF SOMEONE HAS PAID EXTRA FOR EXTRA SERVICES)

PDF FILE OF THE ORDER WITH TOTAL AND SIGNATURE LINE THAT WE CAN GENERATE AUTOMATICALLY THAT CAN BE E-MAILED TO CUSTOMER SIGNED BY THEM AND RETURNED VIA MAIL OR FAX TO PROTECT MERCAHNATS BETTER AGAINST CHARGEBACKS.  (SIGNATURE IS SO IMPORTANT)

BE ABLE TO PUT A COMMENT IN BOX WHEN CANCLLING ORDER SO PERSON KNOWS WHY IT WAS CANCELLED

ADD BUYER'S EMAIL TO CUSTOM DATA EXPORT UNDER ORDERS (FOR SENDING TRACKING #'S VIA STAMPS.COM AND OTHER SOFTWARE)

just some ideas for a better cart .....always room for improvements

cannot wait for next update :)