How do you create a control for use in PowerPoint and other Office Appfications

Howdy!

I the good old days of VB6 I could create an ActiveX control and drop it into PowerPoint or any other Office application and use it. I have developed a webservice based application that I would like to create a control that accepts a few parameters and then calls my webservice, and then displays the results. I specifically want to do this in in PowerPoint. Any advice on how to do this these days?

Thanks!