Citrix's Program Neighborhood Agent is a great way to access MetaFrame farms. Unfortunately it can only communicate with a single environment at a time--a problem for people who travel among locations or customers or who want to test multiple user accounts. Gus Pinto has written a free PN Agent Profile Manager that streamlines this process.
The PN Agent Profile Manager has a simple GUI that gives you a drop-down list from which you can select the current profile you'd like to have the local PN Agent use.
This allows you to test multiple accounts from a single client device, or to have different configurations saved for different MetaFrame environments. (This is perfect for the traveling consultant!)
You can add as many profiles as you want in this simple (and free) add-on. Thanks Gus!