Applescript for moving recently added files (not created or modified) to another folder?
The answer depends on what version of OSX you are running.

Snow Leopard doesn't appear to store Date Added or Creation Date of files.

$ stat -x testfile 
  File: "testfile"
  Size: 7            FileType: Regular File
  Mode: (0644/-rw-r--r--)         Uid: (  501/ vic)  Gid: (   20/   staff)
Device: 14,2   Inode: 12130091    Links: 1
Access: Mon May  5 21:49:18 2014
Modify: Mon May  5 21:49:15 2014
Change: Mon May  5 21:49:15 2014


For Lion and later, there are a couple of ways that Google revealed:

Try the following code  taken from 

https://discussions.apple.com/message/23974953#23974953

tell application "Finder"
    set latestFile to item 1 of (sort (get files of (path to downloads folder)) by creation date) as alias
    set fileName to latestFile's name
    log "Created/Added Date: " &amp; (get creation date of latestFile)
end tell


Alternatively have a look at the code that uses the mdls command line tool as shown here

https://secure.macscripter.net/viewtopic.php?id=37910

Unfortunately I am running Snow Leopard and cannot test the above.