There's an applet at the home display which you can configure to permanently show a selection of shortnumber contacts. Those I have displayed are my gmail/gtalk contacts. To import contacts automatically from your gmail account you'll have to set them as 'Show in quick contacts always' in contacts (from your browser logged in at gmail). Then, if you've set up your google account in the IM on the N800, they'll be automatically imported into contacts on the N800. The applet will let you monitor who's online (and they will see you, if that little ball in the status bar is green).