I forgot to post on blog that I finally found some time and finished product page for B2BLink. It’s an extranet portal which allows customers to place orders which are immediately transfered to ERP system. Customers are also able to see current billings.
It integrates with Subiekt GT Sfera which is one of the major vendor for small bussiness erp software.
Unfortunately all mentioned pages are in Polish, feel free to use babelfish ( does it support polish?? )