If you're using Internet Explorer 9 Beta, one thing either you may have notice or you may notice is that there's no extra search box and you can search direct from the address bar which's great and helps declutter the design IMO. However this can cause a problem if you enter in an intranet address, as it'll not find it and take you to a search results for that term:
If you're lucky the intranet name might be recognised and you'll get the new Notification Bar pop up asking you if you want to go to intranet site:
However you can get IE9 to go straight to your intranet site by simply adding a / onto the end of your address
IE9 then adds the additional http:// and you are sent direct to your intranet page.
You can of course add your sites as well to the Intranet Zone within the settings. Choose Options - Internet options - Secuity tab - Local Intranet - Sites - Advanced.