The only "interactive advertising" are the little thumbs up adds that appear when you FF past a commercial which has special instructions embedded in the VBI stream. Although last I heard they stopped using these because of a bug in the software which caused them to stay on screen after the user hit play.
There are no ads in the EPG or any of the search menus. There are yellow star promotions on the TiVo Central page, but you explicitly have to select them to actually see anything other then the title.
The only thing new that's come out is the new Product Watch application under Music, Photos, Products & More... menu. It's a special GUI that allows you to select products of interest and then it will download videos/advertisements which are related to that product to your TiVo. It is completely opt-in and can be stopped at any time.
Developer for VideoReDo