TDI Driver is mostly used today for personal AV products. I know there are number of parental control, spam filters products that use it as well.

I’m not a fan of TDI, although it has its place in doing networking filtering, it’s time is up and in one and a half year it will be phased out, so I don’t see any reason to start a project using TDI.

You can read this nice article about the difference between LSP and TDI.

Barak