Now, mobile preferences has its own tab on the settings page...
But it doesn't work for me right now: http://www.google.com/ig/settings

For some weeks, they've been many updates/features release that fail and are not fix before many days.

I don't know how long the mobile preferences tab won't work, but I'll keep an eye: with or without the developer sandbox, the tab fails, and iGoogle isn't "BETA".

It works for me in Firefox. There's even a permalink for the mobile settings: http://www.google.com/ig/msettings

Firefox and Chrome both display an empty tab.

But I've got many troubles with my iGoogle, despite many restores (restoration?), backup, sandbox removes, demands for help (forum and help center), etc.

My account must be broken and Google doesn't listen to me :(