I've seen a lot of posts that are essentially saying, "good riddance." However, I will miss Songbird. Let me tell you why.
When Songbird was first released, it ate through way too much memory for me to be able to use it in Linux. I love the features though, so I kept checking back as new releases came out. By about version 1.0 or so, the memory leaks were taken care of, and it was a great music player! It has far more features than Rhythmbox, especially for managing your song library and meta-data (I have about 12,000 songs, so I appreciate this). As compared to Amarok, it knocked it out of the park. Amarok crashed for me all the time (I've heard it doesn't do well with large libraries), I personally find it ugly, and the layout is unnecessarily cluttered. Songbird has worked like a dream after they fixed their beta-version issues. It's nice to look at, easy to use, very customizable, and should also make iTunes users feel at home (although it has many, many advantages over iTunes).
So Songbrid, I will miss you. I'll keep your current version on my system for as long as I can, but with my distro upgrades, etc., you will probably be swept away within a few years. So long, and thanks for all the music.