Use a Built-in Shortcut to Ease Screen Sharing in 10.6
If you use Screen Sharing a lot in OS X 10.6, there are a couple ways to make it easier to connect to your Macs. First, there's ScreenSharingMenulet, which places an icon in your menu bar, showing machines you've previously connected to via Screen Sharing. If you'd rather keep your menu bar uncluttered, though, here's a built-in solution.
In 10.6, every time you connect to another Mac using Screen Sharing, the system creates a shortcut to that Mac.
To find these shortcuts, navigate to your user's Library -> Application Support folder, where you'll find a folder named Screen Sharing. Inside that folder is a .vncloc file for each Mac you've connected to; double-click any one of them, and you'll initiate a connection to that machine.
To make things even easier, though, you can drag this folder to your Dock or Sidebar, where you'll be able to get at it with a click mouse click. Alternatively, using a tool like Butler, LaunchBar, Quicksilver or many others, you can access the folder via a keyboard shortcut.
For example, I've got my folder wired into Butler, so it creates a pop-up menu whenever I press Shift-Control-A. This gives me instant Screen Sharing access, regardless of which application I may be using, and without reaching for the mouse.