Finding Daedric Shrines Options

[Neo Bandit]

I have decided that I am not going to finish the MQ until I get all the daedric artifacts so I can decide which one to give to Martin. You know, give him the most useless one then display the rest in my Skingrad house. Unfortunately I'm having a hard time finding the shrines. I found about 5 but there seems to be quite a few more. I don't want a spoiler (no giving away the locations please) but if any of you have any advice on techniques for finding them I'd like that.

All I do is get on a horse and run all over the country until I find one. I found 1 that way, the rest were told to me by random people. Is there an NPC who knows many of the locations? A book maybe? My method is ok, but all those damn Oblivion gates...

Thanks a lot!