Ability to create a list of song without downloading them

I think we need a feature which lets us save/tag artists in the Zune software without the need to download them. Lets first look at the problem this feature will solve:
Problem 1
I have a Zune pass. Sometimes I will play a new song and start looking for new music from various sources. I will find something interesting about some new album/artist but right now I have to copy and paste the name in Notepad and make a list. This is especially true when I am getting information about my music from sources outside Zune, like Pandora, LastFM etc.
Problem 2
I may find 5 different song/album to try but I do not have time that that moment to go through them. I have to make a list and save it.
Solution:
Zune software should let me keep this list of song/album which I can come back to later. I should not have to download these songs. In Other words I am just tagging these songs/album which I can try out later.
I though it will be nice to have this feature and Zune becomes my source of maintaining list songs which I might try later.

Have you tried using the right-click -> 'add to cart' thing?

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Marques Lyons (tromboneforhire)
Zune MVP
Contributor, http://www.insidethecircle.net

That works crudely. But it would be nice to have my own tags where I can maintain different lists. In cars there is just one single long list. By tagging I might want to keep the name of source like LastFM or other tags which will help me identify the origin of my discovery. Its just more flexiable.