This might already be possible... but if not, I was thinking it would be cool if we could do "intelligent" searches that are based on variables rather than fixed values.

The most obvious example I thought of was with dates... I would love to have a saved search, for example, that is "Added this Week", where in the search terms I could do "Date added > [today]-7" or something along those lines. The same would be cool with modified dates and things like that... I thought of this when I found that when I added a number of items at once and then wanted to go in and tag them, finding those items took a few steps.