The whole idea of apps like GMDesk is to get your web-based productivity tools onto your desktop, without the need for a browser. GMDesk does put all of the majorly helpful Google apps into a single window shell, lets you switch between them hotkeys (Ctrl+1 for Gmail, Ctrl+2 for Calendar, etc.), and switch to domain-hosted Google Apps versions of those webapps instead, which alone might make GMDesk worth it for anyone working both a personal and work-related Gmail account.
