Maybe you've already seen it under "Steam" Settings" and "Account" - Beta Phase .. the Steam UI Beta. It's new Skin with soundpacks etc. for steam by valve. Maybe it comes next for everyone here are some screens.
hm rly its released long time? huh lol? sometimes ago i activated some beta too but nothing happened. today i got a advert from a beta version i activated it and everything is changed hmm. And you say its old? Because on the Steam forum is a topic with a post from 2day that the ui is new ..
I have been using it for at least 1 month, I think nearly 2, maybe even as early as 2010. Don't know for sure though.
http://www.halflife2.net/2010/02/23/new-steam-ui-beta-released/ The post say it was February the 23th when it got released, we probably used it since then
already experiencing a bug. (after some search I found the similar problem already on the steam forums) I'm currently re-downloading the Half life 2 series and if I look at the "library" tab, it says I'm downloading with 1.9 MB/sec but if I put my mouse on the little steam icon in my taskbar it says I'm downloading with about 600-700 kb/sec (which is usual for me). and unfortunately the icon is right xD