I have been creating my own virtual recipe box on KraftRecipes.com and MarthaStewart.com.  It is so cool!  You can search for recipes you want to try, save them to your recipe box, and then look them up at a later date.  On KraftRecipes.com one can even generate a shopping list.  The user just has to select which recipes they would like to create a shopping list for and viola!  It is very easy to edit the shopping list once it is generated.  Then, simply print and be on your way.