Problems with printing from Internet Explorer

Hello everybody!

I work in a software company and we receive from our customers a lot of claims on Internet Explorer Print function.
Finally we decided to create a plug-in for Internet Explorer, which helps to manage webpage printing (www.printwebpage.net).
Please help me with your ideas to create a product which will be really useful!

My questions are:
What are the main problems you face with in webprinting?
Which features do you need to be totally satisfied with printing from Internet Explorer?

Thanks in advance for your help!
Hel.