I have never planned a weekly menu...ever.  Although I do frequently browse Allrecipes.com for new recipes and try them often.  I usually shop a few days a week rather than one large trip once a week.  
My husband is in Vegas for some consumer electronics dealy so when he is out of town I usually make really quick things that don't take much effort.  Usually it ends up being the things my kids like best like chicken nuggets and macaroni and cheese.   

  Yesterday I made macaroni and tomato juice (it is good, trust me) and all three kids ate every bite.  It makes me mad when I spend all day looking up a great new recipe, going shopping for the ingredients, making the meal only for them to take a few bites and claim they are finished.   

  My son usually eats those meals and loves it, it is the other two who would rather have chicken nuggets than chicken florentine.   

I have no idea what I'm going to make tonight.  I have some hotdogs and macaroni and cheese, I just may make that.  I am such a sucky Mom.