LocateTV.com is a website that will tell you the next time your favorite episode of a TV show will be on in your area, along with the channel. You can even set your service provider by inputting your zip code and then selecting from a list of providers in your area.
I'm happy to say that "Barney and the choir" is on THURSDAY, May 15 at 7 PM on TV Land. I've already emailed the choir members.
BTW, you can also embed a reminder badge in your blog or webpage like this:
I know, I know, totally useless information, but we all have our favorite shows, and it's nice to be able to set the VCR, Tivo, or DVR to record them.