I will be attending the The 7 Steps to Go Paperless workshop on June 25th at the NASDAQ Marketsite in NYC. This is going to be a hands-on demonstration of Commerce Bank's Electronic invoice products. I looking forward to test driving this system! Here's a link to their site: http://www.commercebank.com/eipp
You can expect plenty of pictures and a summary of what I find out about their product (all will be on my blog post, soon after the event).
If you can think of any good questions I should ask them, please add a comment. I will get the answer for you!