XCode won't load more than one application at a time on my iTouch?

I got the latest SDK, installed the latest firmware, re-generated the provisioning profile. Really, everything works exactly as expected, and xCode installs my application normally, but if I, say, try to install two different sample projects, HelloWorld and TheElements, when I "Build and Go" the second application, it deletes the previous application as part of the installation procedure. That is, TheElements will be installed, and HelloWorld will be deleted.
This only happens on the device, not in the emulator, and happens with any application, not just these two. I just can't install more than one app on the device.
According to iTunes, there is plenty of room on the actual iTouch. Also, in Organizer, rather than a checkbox next to the Application, there is an "arrow". When I click the application, I see "Application Data".
What the ****? Is this normal for iTouch? Are only iPhone developers allowed to develop more than one application at a time?

you must create an application ID
(use program portal - App ID) and in provisioning make a profile with the new App ID, and use the
same profile in your 2 applications
In Xcode for your project , (2*click target) section properties, use different names as Identifier, and you can have
more than one of your applications installed on the phone. I use identifieres as
dk.mochasoft.abc
and
dk.mochasoft.xyz
I think when you release the applications to App Store, you will need different Profiles for the applications. The Apple documentation is a little weak on this subject.

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