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Do you use the speakerphone on your device when you get a call?  Do you want the speakerphone on your device to automatically be enabled when a call comes in? Ed Hansberry from Pocket PC Thoughts found a neat piece of software that looks like it could do the trick. Ed indicates that at this point in time the application is free and still in beta. In fact he points out that before running it, you have to manually create 3 registry keys so it works properly. There are instructions on the site.

SpeakerPhone – Auto On v1.02 will automatically turn on your speakerphone. While the application is running, when an incoming call is received, the speakerphone of your device will automatically turn ON when you receive the call.
You can also automatically activate the speakerphone when you are making an outgoing call by checking the Outgoing ON in the menu.

It should work on smartphone and PocketPC WM5/WM6

Check out SpeakerPhone – Auto On v1.02  here.