>Anyone here familar with Delphi?

Delphi is a great tool for Win32 apps - much easier than C++

>Can you use infragistics with it?

Don't know about infragistics.
DevExpress seems to be king of the Delphi component hill now.
Infragistics must have a forum or newsgroup somewhere, and they will know how well it works in Delphi.

Delphi can use ActiveX components, however native Delphi VCL components have a lot of advantages.

You can ask anything you need to in the Delphi newsgroups.

http://support.codegear.com/newsgroups/directory/delphi