There is no real "specific" delphi documentation.

There are articles on this site that talk about plugins.
You can also check out msdn.microsoft.com and do a search for mappoint object model or somthing. There you will find ALL the docs for how to use the mappoint object model.

If you know delphi and some com then you shouldn't have a problem getting things to work.

Also... the activex control does not work right away in delphi. If you do a search on these forums you will find a post by me that shows you how to get it to work in delphi.

If you have any other questions send me a PM or e-mail.

Good luck,
Chris