The problem
If you're like me, and enjoy using the IIS to debug your sites, then you might've run into the problem where there are a heap of w3wp-processes running simultaneously. How do you know which one to attach to to get into that debugging goodieness?

Aaarrgh!
The solution
There is a command in windows that allows you to resolve these w3wp-procceses into their application pool names. Yay! So, if you've created separate application pools for your local websites (which you should) then you'll be able to resolve the w3wp-processes for them.
Now, you really don't want to open up a command prompty every time you want to resolve your processes. Or write a .bat-script. Instead let's integrate this solution into Visual Studio!
In Visual Studio select Tools -> External Tools and click Add.
Make it look like so:

Now the tool appears in your Tools menu as Resolve w3wp processes.
Here's the end result when you click it:

Now attach to that process and debug like never before!