We can expect a wave of app with upgraded capabilities when Windows Phone 7 Mango is officially released.
NZ Bee can however give you a taste early with their Auckland Traffic App, available for dev-unlocked devices now.
Their updated app features traffic cameras pinned as multiple live tiles, updated automatically using a background agent, and also fast app switching to allow one to jump in and out of the app instantly.
It also demoes the new programmable status bar, which allows more screen space to be used for content.
NZ Bee is making the XAP available for download from their website.