[uof]

I've found this works well:

I have a folder in projects called "lists" and it has single action lists in it for things I'm thinking about buying, or do - one for books, one for dvds, one for gadgets/iphone apps etc.

All the items are under a context called "someday list" that's on hold.

I find that's better than having the whole list on hold because when I decide to actually buy something from the list I just change it's context to "errands day" or "bookshop" or whatever and it becomes a live task...