I am registering sidebars automatically for each category (a separate widget space per category). The technique I'm using is here.
In the admin side I have an options page where I need to display a dropdown of all registered sidebars... Is there are way to dynamically get this list of registered sidebars? since they're being registered in functions.php I assume they're in memory, not in the database.
I could keep track of the sidebars I register in some global variable, but just in case plugins register their own sidebars, I'd like to account for them too.
I'll dig through the core if I have to, but thought someone might know off-hand:)