There are tons of them out there. It really depends on how much time/effort your willing to put in.
5 days on 2 days off. Sometimes its 6 others its 4. Just depends on how my body feels that day. I do one muscle group a day no more and that has done wonders for me for certain parts of my body.
Give some more info about what your looking for and how much time you have and we can give you better advice...Also, if you use the search function on the top of the page and go to expanded search, type in "routines" in title section only, you'll find tons of info about different approaches. Right now 5x5 is probably one of the most popular ones.