Best way to store game assets?

Hi,

Is there a way for Flash to store content that will not be deleted with the browser’s cache?
Imagine a game that runs in the browser but is still heavy enough that you don’t want your users to go through downloading assets again every time.

Now that LSO obeys browser cache deletion (it does, right?), is there another way? Using Air would work but you’d have to download and install a client, which defeats the purpose of browser games.

Thanks!