Creating a Web App using BizTalk 2010

I'm fairly new to BizTalk and just written my first code using an online tutorial which processes an XML request (dropped into UNC share) and based on some process/rules generates some XML output (on another UNC share). Works nicely!

Next up I want to try something which is initiated by a user (or interacted with in some way).

I have successfully WCF and Web Publishing wizards but would like to know if i can take it a step further and actually present a web form/app? (without re-inventing the wheel so to speak and start from scratch writing an application to consume the service)

Thanks
L