I have two TiVo's and I really love them. Both are TiVo HD.
I was thinking that there might be an app for TiVo for the iPad and a Google brought me to this at TiVo's site: TiVo App for iPad - TiVo
This app looks really nice. But for some reason TiVo made this app to just work with their latest model that just came out this year, the TiVo Premier. I'm a little peeved. I don't think there is that much difference in the two platforms that it wouldn't work for the TiVo HD and the model before that, the S3.
Anyway if anyone is interested, it should be out in the next few weeks. I doubt that many people on here own TiVo's but I thought I''d mention it.