The interface was subtly broken for quite some time, because of a broken w-b synchronization script. It's fixed again, so those who stopped using it because it lagged for months can use it again, and know that I'm the one to prod if it's broken.

Also, a nice unknown feature is that if you want the state of $package in experimental, the following alias DWYM[1]:

 http://experimental.debian.net/$package

Notes

[1] It's not a new feature, it's here for a long time, but few people actually know about it