Hi,
The CS 5.5 distribution that comes with the PhoneGap build is a little bit outdated (march 2011). If you dare doing it you can update it yourself by replacing the PhoneGap.js and PhoneGap.jar with corresponding modules from the PhoneGap site. Go to (for Windows & Android):
drop the PhoneGap.jar in:
/program files/adobe/Adobe Dreamweaver CS5.5/configuration/NativeAppFramework/DWPhoneGap/Android/PhoneGapApp/libs
drop the PhoneGap.js in:
/program files/adobe/Adobe Dreamweaver CS5.5/configuration/NativeAppFramework/DWPhoneGap/Android/PhoneGapApp/assets/www
I have not worked out what would be needed for Iphone but of course firstly you'll need a Mac.
I did it and it rocks. It is very fast lane to getting your app code up on the emulator. Patching CS5.5 is of course at your own risk.
If you are using Eclipse it could worth the effort to see that your SDK is up to date: I had lot of problems with slow and malfunctioning AVDs (Android Virual Device): Things like extreemely slow loading, repeatedly crashing processess (Android Acore stopped responding etc.), strange japanese keyboards and much more. It did seem to matter much which "make", API or version, just some worse than others.
The last update gave me the SDK Tools Manager 12 among other things and suddenly my AVDs loads decently fast and without crashing anymore.
One problem with the last update is that Eclipse looses the reference to the Android SDK which is reported as a problem. You easily fix this by patching the reference in Eclipse "Window/Preferences" by typing the old-fashioned DOS path:
c:\progra~1\android\android-sdk
The best functioning AVD i found was the Google API level 9 version 2.3.1
I am developing on one Win XP 32 bit and on one Win 7 64 bit.
Regards
/Ralf