For more tribute material (in addition to music), search for 'wtc tribute mp3' on Google or hit these links:
These sites have a ton of material, links, poetry, memories, screenshots, etc. The last is a strengthening slideshow (sort of) done in macromedia.
At one point I had a link here to a mp3 called "Live - Overcom". It was a mix of a song and various disastor news clips. I'm not exactly sure of it's origins... just got it from a friend. As you can hear, it's an expert mix of news clips, people's stories from the streets, music, and so on. Personally it reminds me of the day when we were all huddled in the Nest, trying to grasp the enormity of what was unrolling. --Wim