That is a universally used UI metaphor, yes. Certainly what I use to go to home.
But I think also home should be in the breadcrumb, that's what the breadcrumb is for.
Marketplace -> diyAudio Store
We wanted to make it clear that the forum is the forum and the store is the store, and the forum has editorial independence, but both can happily co-exist. We might promote it further in the UI in the future. One thing at a time, we're seeing how the new nav feels for a while.
