Preview in Internet Explorer with VMWare Fusion
Here's an awesome tip on how you can preview your web site in Internet Explorer from within the Coda environment:
Step 1
VMWare Fusion version 2 or higher is required. Download and install VMWare Fusion 2 (currently in beta). If you don't already own VMWare Fusion, use their provided beta serial number, also shown on that page.
Step 2
Install whatever version of Windows you happen to have lying around. I created two virtual machines: an XP installation running IE7 and a Windows 2000 installation running IE6.
Step 3
Make sure you install the VMWare Tools on the guest operating system.
Step 4
For maximum impact, set VMWare Fusion to Unity mode:

Step 5
Flip over to Coda and preview a random URL:

Step 6
Press and hold the External Preview popup button in Coda. You should see entries for Internet Explorer for each Windows virtual machine:

Step 7
Be amazed as IE appears with your URL!

Now that you have set IE as your preferred external browser for Coda, you only have to single-click the External Preview button in Coda to load it up.